Below you can see a changelog, which was made on 5.4.8 for 2 months, from 25.06.15 to 07.09.15:

Status: applied on all realms.

List of changes:

General:

- Fixed search in AH for other client languages.
- From section buying characters in the control panel removed characters, that don't conform a new criterias (as previously planned).
- On a server hardware upgraded operating system packets and now will be using another compiler, this should have a positive effect on performance.
- Fixed bug where it was impossible to invite player to group at once.
- Implemented stream system for achievements, must seriously affect on increasting performance.
- Fixed work of various portals, which had problems after the latest fixes.
- Implemented work of tickets system in the game.
- Fixed problems with the gold on the black market.
- Fixed work of all the commands for chat channels.
- Added 2 second cooldown to send messages in the chat to prevent spamming/flooding.
- Fixed a bug where the process could stop responding at the rename of character.
- Fixed crash of client that was because of spam emotions.
- Rewritten work of server cooldown.
- Many fixes to the transmogrification.

Instances and raids:

Throne of Thunder:
- Fixes to next bosses in the raid Throne of Thunder: Durumu the Forgotten, Iron Qon, Jin'rokh the Breaker, as fixed loot from this bosses.
- In the Throne of Thunder now available the achievement from the last boss in normal mode, which is necessary to enter heroic. In the heroic mode are also available all the bosses, including the final boss Ra-den.

Siege of Orgrimmar:

- Fixes to first and second bosses in the Siege of Orgrimmar, added loot and achievements.

Instances and raids, others:

- Many fixes to raid Mogu'shan Vaults, fixed all known bugs.
- Many fixes to the cave Shado-Pan Monastery, fixed all known bugs.
- Many fixes to the Heart of Fear raid, fixed all known bugs.
- Many fixes to the instance Stormstout Brewery, fixed all known bugs.
- Many fixes to the instance Siege of Niuzao Temple, fixed all known bugs.
- Many fixes to the instance Temple of the Jade Serpent, fixed all known bugs.
- Many fixes to the instance Mogu'shan Palace, fixed all known bugs.
- Many fixes to the Terrace of Endless Spring, fixed all bugs which was known.

- Fixed access to the dungeon Hour of Twilight.
- Fixed displaying information about the scenarios in the interface.
- Closed access to scenarios, that don't conform the player's fraction.
- Implemented system of automatic loot for some items in dungeons and raids.
- Rewrote work of raid marks.
- Implemented scripts to bosses in dungeon http://wowhead.com/zone=4196.
- Fixed loot in the raids Mogu'shan Vaults and Heart of Fear.
- Fixed bug with high damages for different classes, this happened because of problems with the calculation of the maximum melee damage, when turned negative number of damage, which was converted into a positive incorrectly.
- Fixed a bug, where spells can get stuck after unsuccessful cast, for example, after a miss.
- Fixed a bug where bosses in Firelands give valor points.
- Fixed work of deserter when you exit the dungeon by Dungeon Finder.
- Now players will not get valor / justice points after 85 level in the instances until MoP content.
- Fixes to the instance Siege of Niuzao Temple, fixed bugs that emerged after rewriting the instance.
- Fixed bug when hunter's pets could be lost or bugged after some instances.
- Fixed a bug with the advent of the horde NPC for the alliance characters in the Ragefire Chasm.
- Fixed an exploit with the boss General Pa'valak in the instance Siege of Niuzao Temple.
- Fixed bug with tabards and reputation in Cataclysm and Pandaria dungeons.

Scenarios:

- Implemented script to the horde version of scenario Theramore's Fall.
- Implemented Challenge Mode for many dungeons.
- Implemented work of new scenario: Blood in the Snow.

Professions:

- Fixed work of following professions spells:
http://www.wowhead.com/item=94111/lightning-steel-ingot
http://www.wowhead.com/item=98717/ba...trillium-ingot
http://www.wowhead.com/spell=146921/...trillium-ingot
http://www.wowhead.com/spell=140041/...ence-of-scales
http://www.wowhead.com/spell=142976/...gnificent-hide
http://www.wowhead.com/spell=146923/...gnificent-hide
http://www.wowhead.com/item=82447/imperial-silk
http://www.wowhead.com/item=98619/celestial-cloth
http://www.wowhead.com/spell=146925/...elestial-cloth
http://www.wowhead.com/spell=138877/...rescent-reborn
http://www.wowhead.com/spell=138879/mooncleaver-reborn
http://www.wowhead.com/spell=138888/fireguard-reborn
http://www.wowhead.com/spell=138890/blazeguard-reborn
http://www.wowhead.com/spell=138889/...t-blade-reborn
http://www.wowhead.com/spell=138891/...hampion-reborn
http://www.wowhead.com/spell=138882/...-hammer-reborn
http://www.wowhead.com/spell=138885/dragonmaw-reborn
http://www.wowhead.com/spell=138883/thunder-reborn
http://www.wowhead.com/spell=138884/deep-thunder-reborn
http://www.wowhead.com/spell=138876/...ar-edge-reborn
http://www.wowhead.com/spell=138878/...ar-edge-reborn
http://www.wowhead.com/spell=143646/...t-and-its-uses
http://www.wowhead.com/spell=143644/...e-and-its-uses
http://www.wowhead.com/spell=143626/...h-and-its-uses

Battlegrounds and Arenas:

- Fixed bug where on battleground The Battle for Gilneas points for bases accrued too slow.
- Fixed displaying spending time on BG.
- Fixed bug where after leaving from BG player with flag didn't return to the base and other players also should leaving or wait 25 minutes before BG will be end.
- Now on BG will be spent a lower of traffic through the optimization of sending packets.
- Fixed bug where incorrectly displays player's position on BG map after his teleportation.
- Fixed displaying flag of the opposing faction in Battleground Warsong Gulch.
- Fixed BG spells http://www.wowhead.com/spell=46392 and http://www.wowhead.com/spell=46393.
- Fixed bug where it was impossible to defuse bombs on the Battleground Isle of Conquest.
- Fixed displaying of RBG statistics.
- Implemented rule of 6 seconds for drinks on arena.
- Rewrote the algorithm for the formation of the battle participants on the arena, now choice of opponents must be a little faster.
- Fixed an exploit with the logout on BG-arena.
- Spell http://www.wowhead.com/spell=134735/battle-fatigue no longer affects the bandages from the First Aid.
- Fixed the different PvP achievements related to the killing of players certain class/race.
- Fixed exploit with spheres on th BG Temple of Kotmogu.

Spells and talents:

Rogue:

- Fixed spells interaction http://wowhead.com/spell=121152 and http://wowhead.com/spell=111240
- Fixed a bug where http://www.wowhead.com/spell=51713/shadow-dance effect on many other spells, and reduces expenses of energy for them, and not only for a Ambush.
- Fixed bug with the talent http://wowhead.com/spell=74001 when he didn't have procs of spell http://wowhead.com/spell=74002
- Fixed a bug with spell http://mop.wowroad.info/?spell=79096 where he could work in all specializations.

Mage:

- Fixed the mechanics of work spell http://wowhead.com/spell=115610
- http://wowhead.com/spell=140468 now work correctly with real spell power and not only with basic.
- Rewrote http://www.wowhead.com/spell=76613/mastery-icicles.
- Rewritten AI for http://www.wowhead.com/spell=84714/frozen-orb.
- Fixed http://www.wowhead.com/spell=108978/alter-time.
- Fixed a bug where Glyph of Mirror Image does not work for arcane mages.
- Fixed the effect of Battle Fatigue to spell http://mop.wowroad.info/?spell=1463.
- Fixed radius and model for http://www.wowhead.com/spell=113724/ring-of-frost.
- Fixed using of http://www.wowhead.com/spell=108978/alter-time under the influence of a friendly http://www.wowhead.com/spell=8177/grounding-totem.
- Fixed http://wowhead.com/spell=115713
- Fixed bug with incorrect mana regen for spell http://wowhead.com/spell=12051

Monk:

- A lot of fixes to spell http://wowhead.com/spell=101643:
* Fixed movement
* Now you cannot taget it
* Fixed displaying of model and transparency
* Now you can't agree and damage it
- Fixed bug where use of spell http://www.wowhead.com/spell=116694/surging-mist interrupted maintaining spell http://www.wowhead.com/spell=115175/soothing-mist.
- Fixed http://mop.wowroad.info/?spell=120479.
- Fixed a bug where the spell http://www.wowhead.com/spell=115921 only worked for the group, where was the player, and not for the whole raid.
- Fixed effect of http://mop.wowroad.info/?spell=131561 spell.
- Fixed http://mop.wowroad.info/?spell=120482.
- Implemented correct work of spell http://www.wowhead.com/spell=137639.

Priest:

- Fixed terms for work of spell http://wowhead.com/spell=109175
- Fixed the formula for http://www.wowhead.com/spell=81749/atonement according to the changes in patch 5.3.
- Fixed work of http://www.wowhead.com/spell=21562/power-word-fortitude spell in the group / raid.

Hunter:

- Fixed bug with radius for spell http://wowhead.com/spell=130392
- Fixed bug where talent http://mop.wowroad.info/?spell=120679 did not work in some areas of the world.
- Fixed restoring concentration of talent Wild Beast.
- Fixed a bug where http://www.wowhead.com/spell=19574/bestial-wrath in interacting with http://www.wowhead.com/spell=38373/the-beast-within does not remove control effects.
- Fixed damage for spell http://www.wowhead.com/spell=53209/chimaera-shot.
- Fixed a bug where after action of spell Feign Death hunter got up with an incorrect number of health.
- Fixed a typo for spell http://www.wowhead.com/spell=53209/chimaera-shot , damage was overvalued.
- Fixed triggering conditions for spell http://www.wowhead.com/spell=53234/piercing-shots.
- Fixed work of spell stacks http://www.wowhead.com/spell=109306/thrill-of-the-hunt.
- Fixed work of spell http://www.wowhead.com/spell=53253 and http://www.wowhead.com/spell=19623.
- Fixed a bug where the spell http://www.wowhead.com/spell=121818 had a double effect.
- Fixed bug when spell http://wowhead.com/spell=53253 not granted focus.
- Fixed terms for procs of spell http://wowhead.com/spell=53234
- Fixed refreshing of buff http://mop.wowroad.info/?spell=82925
- Fixed damage of spell http://wowhead.com/spell=53351
- Fixed the excessive damage from spell http://www.wowhead.com/spell=56641/steady-shot .
- Fixed the excessive damage from spell http://www.wowhead.com/spell=3044/arcane-shot .
- Fixed trigger conditions of spell http://www.wowhead.com/spell=53260/cobra-strikes .
- Fixed a bug where http://www.wowhead.com/spell=34600/snake-trap haven't been causing http://www.wowhead.com/spell=19387/entrapment.
- Fixed http://www.wowhead.com/spell=20895/glyph-of-animal-bond.
- Fixed trigger conditions and cd spell http://www.wowhead.com/spell=168980/lock-and-load.

Druid:

- http://wowhead.com/spell=114282 now work until you cancel it or change form, not only 30 sec
- Now by activation http://wowhead.com/spell=108292 PvP-power (Healing) will be equal to PvP-power (Damage).
- Now Battle Fatigue and other healing-reduce effects don't work on http://wowhead.com/spell=17007
- Rewritten spell http://wowhead.com/spell=135288
- Now after the effect http://wowhead.com/spell=81022 expires, druid will get buff http://wowhead.com/spell=131538
- Fixed criteria for proc of spell http://wowhead.com/spell=69369
- A lot of fixes to spell http://mop.wowroad.info/?spell=110309:
* Fixed spec checking
* Fixed target checking before cast
* Fixed bug when it could be applied only for players in first group of raid.
* Fixed bug when aura couldn't be removed from target/caster by removing from target/caster
* Fixed bug with aura's removing from caster by teleporting out of target.
- Fixed bug, where a spell http://www.wowhead.com/spell=108299/killer-instinct not add agility equal intellect in form of bear and cat.
- Fixed bug where after using spell http://mop.wowroad.info/?spell=78777 applied only damage and other effects was lost.
- Fixed http://www.wowhead.com/item=67486/glyph-of-the-predator.
- Rewritten spell work http://www.wowhead.com/spell=145108/yseras-gift.
- Fixed bug where after using spell http://mop.wowroad.info/?spell=102792 and when mushroom absorption maximum number of healing , there was no visual lighting buttons of explosion.
- Fixed http://www.wowhead.com/spell=145518/genesis
- Fixed bug where the use of spell http://www.wowhead.com/spell=770/faerie-fire always remove the cd from spell http://www.wowhead.com/spell=33917, not with a 25% chance.
- Fixed bug when spell http://wowhead.com/spell=108373 could work on low levels.
- Fixed bug when rage which was received from the spell http://wowhead.com/spell=5487 remained when exiting from the form.
- Fixed formula for spell http://wowhead.com/spell=50288
- Fixed bug when you gain energy from spell http://wowhead.com/spell=102545 while http://wowhead.com/spell=81022 is active.
- Fixed talent http://wowhead.com/spell=124974
- Now while shapeshifting from http://wowhead.com/spell=768 or http://wowhead.com/spell=5487 mana will not be reset.
- Fixed duration of spell http://wowhead.com/spell=48484 in PvP
- Fixed displaying in combat log and recount regaining energy of spell http://mop.wowroad.info/?spell=114107
- Fixed formula for last tick of spell http://wowhead.com/spell=33763
- Fixed http://wowhead.com/spell=54733
- Fixed taget checking for spell http://wowhead.com/spell=50286 and http://mop.wowroad.info/?spell=146655
- Fixed a formula for the talent http://www.wowhead.com/spell=124974/natures-vigil.

Paladin:

- Fixed mastery's work on spell http://wowhead.com/spell=114637
- Now http://wowhead.com/spell=76671 work on http://wowhead.com/spell=53600 correctly.
- Fixed increase of periodic healing for spell http://www.wowhead.com/spell=114637/bastion-of-glory.
- Fixed http://www.wowhead.com/spell=54937/g...f-illumination.
- Fixed http://www.wowhead.com/item=83107.
- Fixed selection of targets for spell http://wowhead.com/spell=20165
- Fixed http://wowhead.com/spell=26573

Shaman:

- Fixes to triggering spell http://www.wowhead.com/spell=1064/chain-heal.
- Fixed http://mop.wowroad.info/?spell=77222
- Fixed scaling of the critical chance to shaman spells http://www.wowhead.com/spell=108280/healing-tide-totem and http://www.wowhead.com/spell=5394/healing-stream-totem.
- Fixed choice of targets for spell http://www.wowhead.com/spell=5394/healing-stream-totem.
- Fixed choice of targets for spell http://www.wowhead.com/spell=108373/dream-of-cenarius.
- Fixed a bug where Healing Stream Totem healed only one target with the availability of the talent Rushing Streams.
- Fixed Fire Elemental Totem.
- Fixed % of health regen by healing of spell http://wowhead.com/spell=108281
- Rewrote the work of http://www.wowhead.com/spell=73920/healing-rain.
- Fixed a bug where [url]http://www.wowhead.com/spell=117014/elemental-blast gave at once all the characteristics.
- Rewrote work of http://www.wowhead.com/spell=108284/totemic-persistence spell.
- Fixed interaction spells http://mop.wowroad.info/?spell=33757 and http://mop.wowroad.info/?spell=78273.
- Fixed using of http://www.wowhead.com/spell=2825/bloodlust.
- Fixed cooldown reduction from http://www.wowhead.com/spell=157774/...ghtning-shield spell.

Death Knight:

- Fixed HP, armor, attack power by DK's gargoyle and ghoul.
- Fixed bug when http://mop.wowroad.info/?spell=81132 couldn't refresh the duration of http://mop.wowroad.info/?spell=59879
- Rewritten talent http://wowhead.com/spell=108196
- Fixed http://www.wowhead.com/spell=51462/runic-corruption.
- Fixed checking capabilities of casting spell http://www.wowhead.com/spell=123693.
- Rewrote work of http://www.wowhead.com/spell=51052/anti-magic-zone spell.
- Fixed damage for spell http://mop.wowroad.info/?spell=73975

Warrior:

- Fixed modifier for http://wowhead.com/spell=76856 and more correct checking http://ru.wowhead.com/spell=12880
- Fixed http://www.wowhead.com/spell=5246/intimidating-shout.
- Fixed mechanic of http://www.wowhead.com/spell=107570/storm-bolt.
- Fixed damage calculation formula for spell http://mop.wowroad.info/?spell=112997.
- Fixed triggering conditions http://mop.wowroad.info/?spell=76838.
- Fixed diminishing return of spells Shockwave and Storm Bolt.
- Fixed a bug with high cooldown for spells Command Demon and Wrathstorm.
- Fixed bug with 2x proc http://wowhead.com/spell=76838
- Fixed applying aura's http://wowhead.com/spell=131116
- Fixed a bug where the spell http://www.wowhead.com/spell=12292/bloodbath could deal critical damage.

Warlock:

- Implemented work of talent http://www.wowhead.com/spell=108501/grimoire-of-service.
- Fixes to http://www.wowhead.com/spell=117896/backdraft.
- Fixed http://www.wowhead.com/spell=86121/soul-swap.
- Fixed all known bugs in the spell http://www.wowhead.com/spell=5740/rain-of-fire.
- Rewritten spell work http://www.wowhead.com/spell=104315/demonic-fury.
- Rewritten spell work http://mop.wowroad.info/?spell=119898.
- Fixed bug where a spell http://mop.wowroad.info/?spell=108869 gave demonic rage, because it is already doing other dependent spells.
- Fixed work of spell Life Tap after the latest fixes
- Changes in work of spell Soul Swap.
- Fixed bug where Immolation Aura had been giving twice the amount of demonic rage.
- Fixed second part of the spell http://www.wowhead.com/spell=5484/howl-of-terror.
- Improved height checking for spell http://www.wowhead.com/spell=111771/demonic-gateway now in theory it can not be puted on the forbidden altitude.
- Fixed a bug when by using spell http://www.wowhead.com/spell=5740/rain-of-fire with http://www.wowhead.com/spell=117896/backdraft mana for cast not required
- Fixed bonus from SAP for direct damage and dots http://www.wowhead.com/spell=116858/chaos-bolt.
- Corrected formula to calculate damage for spells: http://www.wowhead.com/spell=348, http://www.wowhead.com/spell=29722, http://www.wowhead.com/spell=17962.
- Fixed conditions of casting spell http://www.wowhead.com/spell=108482.
- Fixed formula for spell http://wowhead.com/spell=85692
- Fixed bug when spell's http://wowhead.com/spell=5484 aura could be applied incorrectly.
- Fixed http://wowhead.com/spell=56231
- Fixed spell http://wowhead.com/spell=108482
- Fixed formula for talent http://wowhead.com/spell=108415
- Rewritten talent http://wowhead.com/spell=108499 and spell http://wowhead.com/spell=119898
- More fixes to the interaction of spells http://www.wowhead.com/spell=108503/...e-of-sacrifice and http://www.wowhead.com/spell=19647/spell-lock .
- Fixed spell formula http://www.wowhead.com/spell=85692/doom-bolt .
- Fixed work of http://www.wowhead.com/spell=56218/glyph-of-siphon-life at using of spell http://www.wowhead.com/spell=348/immolate.
- Fixes in work of http://www.wowhead.com/item=45785/glyph-of-life-tap
- Rewrote work of talent http://www.wowhead.com/spell=108370/soul-leech.
- Fixed trigger conditions for http://www.wowhead.com/spell=56218/glyph-of-siphon-life.
- Fixed a bug where the PvP power didn't affect the spell http://mop.wowroad.info/?spell=6229.
- Fixed work of http://www.wowhead.com/spell=117896/backdraft spell.
- Rewrote work of http://www.wowhead.com/spell=980/agony spell.
- Fixed http://www.wowhead.com/item=42473/gl...falling-meteor.
- More fixes to the spell http://wowhead.com/spell=108683 and spells which modify this spell.

Spells and talents, others:

- Fixed scaling from ilvl for auras of var. trinkets, for example: http://www.wowhead.com/items=4.-4?fi...22;si=3#0+13-2 and other analogs.
- Fixed bug when % parry was too high for Death Knights.
- Fixes to spell http://www.wowhead.com/spell=126392/goblin-glider
- Implemented work of legendary cloaks http://www.wowhead.com/item=102249 and analogs.
- Fixed character's orienation after knockback.
- Fixed displaying of knockback effects for other players.
- Fixed exploit when players could bug haste rating for yourself (in theory).
- Implemented visual effects of legendary cloaks, now they don't work in PvP.
- Temporarily disabled effect of http://wowhead.com/spell=114890
- Start realization quests for legendary cloaks, also implemented basic phasing in locations for more correctly quests implementation.
- Implemented work of warning system losing control (can be disabled in client settings).
- Implemented work of spells, that have more then 1st charge.
- Fixed bug where some auras could do more damage / healing after relog.
- Added checking fraction for portals, fix various bugs where players could use portals of hostile factions.
- Rewrote system of areatriggers, it need for correct implementation of many spells.
- Fixed work of combo points on a miss / parry.
- Fixed work of hit rating cap.
- Fixed bug with spell http://mop.wowroad.info/?spell=20572 on low lvl.
- Rewritten spell work log, now should work more correctly.
- Trying to fix bug when spells by type http://www.wowhead.com/spell=4987/cleanse could missing cooldown.
- Fixed a bug where spells of melee classes could cause greater damage to several million.
- Implemented the work system of additional targets during casting spells.
- Amendments to the removal spells http://www.wowhead.com/spell=57724 and http://www.wowhead.com/spell=57723.
- Fixed stacking for many spells.
- Raid buffs now cannot be applied to temporal pets.
- Fixed the remaining problems with cooldown for spells after teleporting.
- Rewrote the mechanics of work spell http://www.wowhead.com/spell=134735
- Fixed a bug where a change of specialization burned all mana.
- Fixed incorrect value of mana at changing of shaman specialization from the restoration to the elemental and vice versa.
- Implemented system PPM for the following spells: http://mop.wowroad.info/?spell=138757, http://mop.wowroad.info/?spell=138871, http://mop.wowroad.info/?spell=138896, http://mop.wowroad.info/?spell=138939, http://mop.wowroad.info/?spell=138964, http://mop.wowroad.info/?spell=139134, http://mop.wowroad.info/?spell=139171, http://mop.wowroad.info/?spell=146,219, http://mop.wowroad.info/?spell=146313.
- Fixed items: http://www.wowhead.com/item=96398, http://www.wowhead.com/item=75274/zen-alchemist-stone, http://www.wowhead.com/item=83079/tushui-tabard, http://www.wowhead.com/item=83080/huojin-tabard, http://www.wowhead.com/item=94509/so...do-pan-assault, http://www.wowhead.com/item=81266/price-of-progress.

- Fixed 12 reasons for server crash.

- All Data Base fixes - quests, creatures, loot - you can be seem in this section http://forum.pandawow.ru/forumdisplay.php?f=224&page=19 (from 23.06.15 tо 02.09.15), with messages from Herald.

Don't forget to clear the cache of the game after the update.