Below you can see a changelog, which was made for 2 months, from 08.09.15 to 04.11.15:

Status: applied on all realms.

Cross server:

- Fixed bug where honor and reputation rates was x1 for all realms, now it work correctly for each realm.
- Implemented BG announce on each realm.
- Fixed bug where after joining a BG group players received mails with the reward for some achievements.
- Implemented work and data saving in table for arena and BG (overall ladder).
- Fixed bug where on the cross server player always received message "you are not in the guild".
- Fixed guild chat on the cross realm.
- Fixed bug where players always got for the BG winning 150 Conquest Points.
- In theory fixed problem with group and raid displaying after joining a Cross realm.
- Fixed bug where the mounts disappear from the spell bar after joining a Cross realm.
- Fixed bug where arena rating could be negative and for that reason get the maximum value in the DB table.
- Fixed 2 reasons of crash Cross server, remained 3.
- Final fixes to bugs of raid profiles, now thats should be good.
- Now players will be dismounted at entering to BG.
- Fixed a data synchronization from the cross server for anti-cheat system.
- Fixed display of the realm near the nick.
- Fixed using of the relic in Strand of the Ancients.
- Fixed bug with riding skill for death knights.
- Implemented loading of guild spells.
- Fixed work of RBG.
- The beginning of work on the Arena Spectator.
- Remade sending spells on cross server, it should solve the problem with the use of mounts and the disappearance of some spells in the arena-BG.
- Fixed exploit with the exit out of the game on arena.
- More fixes to the system join BG, it should solve the problem with the icon at the mini-map.
- Fixed loading of the players achievements.
- Removed unnecessary NPCs, objects and transport.
- Fixed the remaining problems in work of the arena spectator.
- Rewritten sending of spells and skills to cross-server, it should solve the problem of using mounts and the disappearance of some spells on the arena/BG.
- Final fixes to an exploit with logging out the game during a battle on the arena.
- Rewritten algorithm of a set players in BG, now it should work more quickly and easily and without problems with excess of the limit players for particular BG.
- Made refactoring and removing unused functions.
- Implemented the sending of data about guilds on the cross server.
- Implemented the possibility of sending privat messages to the players who are on the cross-server and vice versa.
- Fixed fuction Player search by name, if he is on the cross server.
- Fixed transfer zones in the registration of new players on the BG and arenas, such as TP fix spectator when he used to hang out sometimes at the end of the download.
- Implemented the sending of awards for achievements.
- Fixed loading of standard spells for the spectator.

- Fixed 13 reasons of crash Cross server.

General:

- Implemented heroic difficulty for scenarios.
- Optimized archeology, now realization is most correctly.
- More fixes to the getting of reputations in the Cataclysm and Pandaria dungeons.
- Optimized code, in theory, the server delay should be reduced by 10-15%.
- Fixed work of raid markers.
- Return the lost verifications for stack of spells. Part 1.
- Fixed a bug where top PvE trinkets didn't reduce ilvl and stats on BG/arena.
- More fixes to the class NPC for the restore of achievements, now it should work for all.
- Implemented the possibility of automatic getting of the achievements when entering a character in the game, if the criteria are met (not applied, we test it).
- Fixed possibility of fast transmogrification.
- Trying to fix combat bug in the instances of the previous content.
- Implemented the possibility of individual choice of rates on the experience, reputations, skills, professions for a particular character, remains to implement a web.
- Fixed work of triggers which was bugged after implementation of cross server, this solve the problems with traps and many objects of mobs and bosses etc.
- Return the lost verifications for stack of spells. Part 2.
- Fixed bug where Battle Fatigue didn't work on hunter pets in PvP zones.
- Fixed removing of temporary enchants, such as shaman's Windfury.
- Fixed a lot of achievements that have not been granted despite the fulfillment of the criteria. Applied only to x100.
- Fixed the bonus experience of heirloom items.
- More fixes to scaling PVE trinkets in BG/arena.
- Optimized work of some parts of the code, also fixed several memory leaks.
- Fixed memory leaks causes of the set, the delay should be lower if the uptime of more than 10 hours.
- Fixed a bug where many things hasn't improvement to the level 4, but should be improved.
- Fixed transmogrification of challange mode gears.
- Fixed a bug where some PvP Trinkets weakened in the arena-BG with PvE.
- Fixed visual bugs with cd on spells magician after the previous fixes.
- Fixed a mechanic of monk's haste, it no longer affects the cooldowns of the monks spells.
- Fixed a formula of calculation for the cooldown Runes from haste.
- Many fixes to event Hallow's End.
- Fixed known bugs with MMR system and its displaying.
- Fixed few exploits on BG Deepwind Gorge
- Fixed exploit with buying incorrect amount of items from a vendor.
- Rewritten system of items upgrading, fixed all known bugs and exploit with the substitution of data per WPE.
- Fixed all known problems with Archaeology.
- Final fixes for stack of spells, debuffs.
- Few optimizations to the radius of search for various objects/npc/spells and use of containers for spells, the server delay should be lower on 10-15%.
- Few fixes to the objects LOS on BG Isle of Conquest.
- Fixed bug where some control effects couldn't work on npc.

- Fixed 5 reasons of crash server.

Instances and raids:

- Properly corrected loot from bosses Twin Consort, Iron Qon and Ra-den from ToT raid. And a small changes to the AI of all bosses.
- Few fixes to the boss Imperial Vizier Zor'lok in Heart of Fear.
- Few fixes to the bosses Tsulong, Lei Shi, Sha of Fear in Terrace of Endless Spring.
- Many fixes to the boss Norushen in Siege of Orgrimmar (added loot and achievements).
- Many fixes to the boss Sha of Pride in Siege of Orgrimmar (implemented, but without loot and not achievements, test).
- Many fixes to the boss Horridon in Throne of Thunder.
- Added Valor Points for the bosses Jin'rokh the Breaker, Horridon, Council of Elders in Throne of Thunder.
- Fixed problems with loading of raids encounters.

Spells and talents:

Death Knight:

- Fixed bug where spell http://www.wowhead.com/spell=146599 could work on an immune target.
- Fixes to the spell http://mop.wowroad.info/?spell=73975 canceled. Because of this spell have bugged damage, problem with damage have other reason.
- Fixed bug when on http://www.wowhead.com/spell=71951 affected only the basic stability, rather than the current one.

Paladin:

- Spell http://www.wowhead.com/spell=20066 can now be interrupted.
- Fixed calculations of cooldown and global cooldown for http://www.wowhead.com/spell=25956/sanctity-of-battle.
- http://www.wowhead.com/spell=25956/sanctity-of-battle now work on http://www.wowhead.com/spell=20473/holy-shock.
- Rewritten work of spell http://www.wowhead.com/spell=20473.
- Final fixes to the work of spell http://www.wowhead.com/spell=25956.

Monk:

- Fixed exploit by the cast http://www.wowhead.com/spell=116694 and http://www.wowhead.com/spell=124682.
- Fixed bug where talent http://www.wowhead.com/spell=115396 started to work without relog.
- Fixed bug where use of spell http://www.wowhead.com/spell=119996 could make you out of combat.
- Fixed a selection and verification of targets for http://www.wowhead.com/spell=115098 spell.
- Fixed mechanics of spell http://www.wowhead.com/spell=73685/unleash-life

Shaman:

- Fixed an exploit with http://www.wowhead.com/spell=117013 spell.
- Fixed mechanics of work spell http://www.wowhead.com/spell=114911
- Fixed bug where on the spell http://mop.wowroad.info/?spell=51558 worked the various heal-modifiers.
- Fixed http://www.wowhead.com/item=45778.
- Fixed a bug where it was impossible to update the stacks of spell http://www.wowhead.com/spell=974.
- Now http://www.wowhead.com/spell=77130/purify-spirit shouldn't get CD if dispelling was performed unsuccessfully (nothing to dispell).
- Fixed bug where http://mop.wowroad.info/?spell=77657 from http://mop.wowroad.info/?spell=3599 stacked in all specializations.

Druid:

- Fixed trigger conditions of http://www.wowhead.com/spell=16870 spell.
- Rewritten spell http://www.wowhead.com/spell=105737/might-of-ursoc.
- Fixed a bug with the double effect of Glyph of Efflorescence
- Few fixes to the work of http://www.wowhead.com/spell=54733/glyph-of-rebirth
- Fixed problems with spell http://www.wowhead.com/spell=1850/dash which was found after last fixes.

Warlock:

- Fixed exploit with HP and talent http://www.wowhead.com/spell=79957
- Fixes to work of http://mop.wowroad.info/?spell=131973 at http://www.wowhead.com/spell=74434
- Fixed a bug when talent http://www.wowhead.com/spell=108415 had not work sometimes.
- Fixed http://www.wowhead.com/spell=56218.
- Fixed bug with incorrect accumulation of demonic fury from http://mop.wowroad.info/?spell=114175 spell.
- Fixed scaling of stats from the owner to http://www.wowhead.com/npc=55659, also fixed a bug when it was giving double the amount of demonic rage.
- Fixes to work of http://mop.wowroad.info/?spell=114654.
- Fixed the casting time of spell http://www.wowhead.com/spell=104027/soul-fire
- Rewritten work of spells http://www.wowhead.com/spell=111771/demonic-gateway and http://www.wowhead.com/spell=48020/d...ircle-teleport, added many checking and conditions
- Fixed http://www.wowhead.com/spell=56242/glyph-of-imp-swarm
- Fixed interaction of spells http://www.wowhead.com/spell=117828 and http://www.wowhead.com/spell=108683
- Fixed work of spell http://www.wowhead.com/spell=117828.

Warrior:

- Returned fixes to the spell http://www.wowhead.com/spell=12292 and crit chance.
- Fixed mechanics of spell http://www.wowhead.com/spell=46915/bloodsurge
- Fixed mechanic of work http://www.wowhead.com/spell=107570.

Rogue:

- Fixed trigger conditions of http://www.wowhead.com/spell=35551 spell.
- Fixed an exploit with the possibility of rogue's infinite stealth.
- Fixed a bug with a double bonus from spell http://www.wowhead.com/spell=84601/assassins-resolve, it's reason why many spells in the specialization Assassination had heightened damage in 20%.
- Fixed a bug where http://www.wowhead.com/spell=55342/mirror-image gets rogue's out of stealth and activates http://www.wowhead.com/spell=108208/subterfuge
- Fixed http://www.wowhead.com/spell=146631/...rrhaging-veins.
- Fixed http://www.wowhead.com/spell=63268/glyph-of-disguise

Hunter:

- Fixed bug where spell http://mop.wowroad.info/?spell=56453 haven't procs from spells http://www.wowhead.com/spell=3674 and http://www.wowhead.com/spell=13809
- More fixes to the spell http://www.wowhead.com/spell=130392
- Fixes to the spell http://www.wowhead.com/spell=19387
- Final fixes to the spell http://www.wowhead.com/spell=130392
- Fixed bug where spell http://www.wowhead.com/spell=82692 didn't give focus to your pet for each stack of spell http://www.wowhead.com/spell=19615
- Fixed bug where spell http://www.wowhead.com/spell=34026 could be used when pet was in any control.
- Rewritten work of http://www.wowhead.com/spell=117050 spell.
- Fixed verification of targets for http://www.wowhead.com/spell=13813 spell.
- Fixed trigger conditions of http://www.wowhead.com/spell=53234 spell.
- Now you cannot evade, parry or block the spell http://www.wowhead.com/spell=34026/kill-command.
- Final fixes to the spell http://www.wowhead.com/spell=168980/lock-and-load.

Mage:

- Fixes to the spell http://wowhead.com/spell=115610 partly canceled because they were incorrectly.
- Fixed a bug with the number of targets for the 2nd part of the http://www.wowhead.com/spell=44425/ spell, also fixed a bug with lots of stacks.
- Fixed coordinates to teleport through the spell http://www.wowhead.com/spell=132627.
- Rewritten work of http://www.wowhead.com/spell=55342 spell.
- Final changes to spell http://www.wowhead.com/spell=44425/arcane-barrage.
- Fixed interaction spell about http://www.wowhead.com/spell=108978/alter-time across time to time
- Fixed the impact haste to the spell http://www.wowhead.com/spell=112948/frost-bomb.
- Fixed mechanics of http://www.wowhead.com/spell=11129/combustion.
- Fixed an issue where the spell http://www.wowhead.com/spell=116011/rune-of-power has not subsided when changing talent or exit the game.
- Fixed interaction of spells http://www.wowhead.com/spell=11129/combustion and http://www.wowhead.com/spell=108853/inferno-blast.
- Fixed bug where Resilience worked on http://www.wowhead.com/spell=83853/combustion
- Fixed many exploits with spell http://www.wowhead.com/spell=108978/alter-time
- Fixed http://www.wowhead.com/spell=115710/...of-deep-freeze
- Fixed bug where Resilience worked on http://www.wowhead.com/spell=12654
- Fixed bug where spell http://www.wowhead.com/spell=5143 damaged after casting, not after hitting the target.

Priest:

- Rewritten spell http://www.wowhead.com/spell=81749
- Fixed a bug where PvP-power didn't affect on http://www.wowhead.com/spell=87336
- Fixed triggering conditions of http://mop.wowroad.info/?spell=109186 spell.
- More fixes to the conditions of procs http://www.wowhead.com/spell=109186
- Fixed mana regen from spell http://www.wowhead.com/spell=123040
- Fixed the conditions of procs for spell http://www.wowhead.com/spell=81749/atonement
- Fixed a bug where the talent http://www.wowhead.com/spell=109175/divine-insight working even if you take other talent from this talent line
- Fixed http://www.wowhead.com/spell=55685

Spells and talents, others:

- Fixed bug where PvP-power worked on the amount of absorption from spell Necrotic Strike.
- Fixed bug in interaction of spells http://www.wowhead.com/spell=51753/camouflage and http://www.wowhead.com/spell=55342/mirror-image
- Partially fixed work of http://www.wowhead.com/spell=83964 spell.
- Fixed a mechanic of http://www.wowhead.com/spell=107076 spell.
- Fixed a bug when http://www.wowhead.com/npc=15438 didn't move.
- Fixed an exploit with damage from spell http://mop.wowroad.info/?spell=116010.
- Fixed the bug where druid's movement speed bonuses could be stacked up to high values.
- More fixes to the DK's Runes regen.

Other

- Fixed items: http://www.wowhead.com/item=94530 and http://www.wowhead.com/item=94511
- Fixed procs from items http://www.wowhead.com/item=102299 and http://www.wowhead.com/item=102292
- Fixed items http://www.wowhead.com/item=94529, http://www.wowhead.com/item=94509, http://www.wowhead.com/item=94515, http://www.wowhead.com/item=96873
- Fixed upgrade for the item http://www.wowhead.com/item=103801 and analogs.
- Fixed items http://www.wowhead.com/item=94512, http://www.wowhead.com/item=75274, http://www.wowhead.com/item=94518, http://www.wowhead.com/item=104476, http://ru.wowhead.com/item=96041.

- All Data Base fixes - quests, creatures, loot - you can be see in this section http://forum.pandawow.ru/forumdisplay.php?f=224 (from 08.09.15 tо 04.11.15), with messages from Herald.

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