Below you can see the changelog, which have been made for one months, from 24.12.15 to 18.01.16:

Status: applied for all realms.

Cross server:

- Implemented synchronization of reputations, achievements and honorable kills by packets not by database requests. It should solve problems with data saving after leaving cross server.
- Implemented information sending about currency cap reset for correct cap change, also fixed displaying new cap after reset.

- Fixed 1 reason of crash server.

General:

- Implemented work of reputation bonuses that influence the whole account, for example http://www.wowhead.com/item=93225, and its displaying in client's interface.
- Reworked bonus loot from mobs, now it works correct.
- Implemented Maneuvers work, but without cross server (only for players of one realm).
- Implemented LFR system, we only have to complete data for concrete raids.
- Fixed guild rewards for quests, now you will get 60k experience for actual quests.
- Fixed a bug with ticket system, when players sometimes couldn't see answers of game masters.
- Fixed a bug, when players could be disconnected after reporting a players per chat report system.
- Archaeology reworked, now works correct.
- Fixed level requirement for all professions.
- Transferred first part of Wotlk core optimizations, server delay should be decreased by 10-15%.
- Fixed a bug with incorrect messages after removing items from auction.

- Fixed 3 reasons of server crash.

Database:

- About 500 bugs were fixed during this month (quests, mobs, loot), also added a lot of AI for mobs and more than 20Mb localizations of quests, npc, dialogues.

Instances and raids:

Throne of Thunder:

- Horridon:

• Fixed a bug, when boss used "Double swipe" several times in a row.
• Fixed a bug, when boss did not strike with his tail while using "Double swipe".
• Added bonus loot.
• Fixed a bug, when Direhorn Spirit did not disappear after wipe.
• Fixed a bug, when Direhorn Spirit could be seen by the whole raid, not only by a player who summoned it.
• Fixed loot for heroic mode.

- Dark Animus:

• After killing Dark Animus players that get into instance will be teleported to Iron Qon.
• Fixed boss location.
• Fixed a bug, when battle did not finish after all players die.
• Fixed a bug, when players could enter the instance during battle with boss.
• Fixed "Crimson Wake" spell.
• Fixed "Explosive Slam" spell.
• Fixed "Matter Swap" spell.
• Fixed "Anima Ring" spell.
• Fixed hitbox of boss.

- Jin'rokh the Breaker:

• "Static Wound" stacks will be correctly disappear after some time.
• Added bonus loot.
• Fixed loot for heroic mode.
• Fixed a bug, when "Ionization Conduction" damaged not only players that stay in water but the whole raid.
• In 25 ppl heroic mode "Ionization" will be applied to 13 players.
• Fixed a bug, when the boss followed tank even after using "Thundering Throw" on him.

- Iron Qon:

• Fixed "Dead Zone".
• Fixed "Frozen Resilience" spell.
• Fixed a bug, when boss did not attack with autoattacks at last battle phase.

- Ji-Kun:

• Fixed nestlings mechanics.
• Fixed loot for heroic mode.

- Megaera:

• Fixed getting valor points.
• Fixed loot for heroic mode.

- Lei Shen:

• Fixed "Overcharged" spell.

- Twin Consorts:

• Fixed getting valor points.

- Ra-den:

• Fixed getting valor points.

- Council of Elders:

• Fixed loot for heroic mode.

- Tortos:

• Fixed loot for heroic mode.

Siege of Orgrimmar:

- Immerseus:

• Boss will appear from the water not only by timer, but also after killing all Sha Puddles and Contaminated Puddles.
• Fixed Sha Puddles and Contaminated Puddles HP for 25 ppl difficulty.
• Added valor points.
• Fixed a bug, when Contaminated Puddles did not move and had full hp.
• Added berserk timer.
• Fixed increased damage of "Swirl".
• Fixed a bug, when "Swirl" aura did not disappear from players.

- The Fallen Protectors:

• Fixed damage of "Inferno Strike".
• Removed "Shared Torment" spell mechanics from normal mode.
• Rook Stonetoe will be passive and non-attackable under Desperate Measures effect.
• Fixed a bug, when after Desperate Measures effect Rook Stonetoe could stop using his abilities.
• Fixed a bug, when Sun Tenderheart could not use Desperate Measures for the second time.
• Fixed a bug, when Incarnation of Despair and Embodied Desperation had lowered healt after second use of Desperate Measures.
• Fixed usage of Noxious Poison.
• Fixed usage of Swift Poison.
• Periodic damage of Garrote will be dispelled from players after Desperate Measures.
• Added valor points.

- Norushen:

• Added valor points.
• Fixed a bug, when a player could pass Trial of Confidence without killing mobs.
• Fixed a bug, when player could stuck in their trials after killing mobs.
• Fixed "Residual Corruption" spell.
• Damage done to Manifestation of Corruption and Essence of Corruption, seen by all players, will be also done to the boss.

- Sha of Pride:

• Added valor points.

- Galakrask:

• Started working on it.

Dragon Soul:

- Spine of Deathwing:

• Deleted valor points , shouldn't be given.

- Madness of Deathwing:

• Deleted valor points, shouldn't be given.

Scholomance:

- Rottlegore:

• Fixed a bug, when players didn't get "Bone Shield" aura after using Goren Leftovers.

- Doctor Theolen Krastinov:

• On heroic difficulty added mob spawn with a few chance after killing Rottlegore.

Scarlet Monastery:

- Removed loot from trash till its correct fix.

Spells and talents:

Warlock:

- Fixed work of http://mop.wowroad.info/spell=114175 after previous fixes.
- Fixed spell damage bonus formula for http://www.wowhead.com/spell=30108.
- Fixed spell damage bonus formula for http://www.wowhead.com/spell=146739.
- Few fixes to the mana cost of http://www.wowhead.com/spell=117896.

Druid:

- Fixed level of summoned creatures by http://www.wowhead.com/spell=33831.
- Reworked http://www.wowhead.com/spell=17007.

Paladin:

- Fixed http://www.wowhead.com/spell=879 work depending on http://www.wowhead.com/spell=122028.

Priest:

- Now different bonuses work on http://www.wowhead.com/spell=48153.
- Fixed an exploit with heal at http://www.wowhead.com/spell=81208 and http://www.wowhead.com/spell=596 interaction.
- Fixed an exploit with heal at http://www.wowhead.com/spell=138301 and http://www.wowhead.com/spell=138302 interaction.

Mage:

- Fixed proc chance for http://www.wowhead.com/spell=112965.
- Fixed a bug at the http://www.wowhead.com/spell=84714 and http://www.wowhead.com/spell=28272 interaction.
- Now PvP-Power work on absorption of http://www.wowhead.com/spell=11426.
- Fixed duration of slowdown from http://www.wowhead.com/spell=116 in PvP.

Hunter:

- Fixed a bug, when http://www.wowhead.com/spell=53253 worked always, not with 15% chance.
- Fixed a bug, when http://www.wowhead.com/spell=34954 worked for a hunter also.
- Few fixes to the mechanics of spells like http://www.wowhead.com/spell=19263.
- Fixed exploit with http://www.wowhead.com/spell=126309 spell after changing specialization.

Warrior:

- Fixed a bug with double damage bonus for http://www.wowhead.com/spell=58356.
- Fixed increased damage of http://www.wowhead.com/spell=6343.
- Fixed a bug with increased damage of http://www.wowhead.com/spell=46968.
- Fixed increased damage of http://www.wowhead.com/spell=118000.
- Fixed a bug, when http://www.wowhead.com/spell=108126 aura was imposed always, not only if you hit the target.
- Fixed a bug with incorrect work of http://www.wowhead.com/spell=6713 on hunters.
- Fixed increased damage of http://www.wowhead.com/spell=115767.

Monk:

- Fixed a bug, when Battle Fatigue and other negative effects worked on http://www.wowhead.com/spell=122280 talent.
- Fixed duration of http://www.wowhead.com/spell=115078.

Spells and talents, others:

- Fixed a bug, when mobs changed their orientation while casting aoe or spells with cone effect and targets of such spells were chosen incorrect.

Items:

- Fixed an exploit with http://www.wowhead.com/?item=66690.
- Fixed a bug, when http://www.wowhead.com/?item=92019 could be used without quest.
- Fixed a bug, when accessories of previous PvP season gave more stats than actual ones.
- Fixed an exploit with http://www.wowhead.com/?item=63031.
- Fixed http://www.wowhead.com/?item=103678.

- All Data Base fixes (quests, creatures, loot etc) you can look at this section (from 24.12.15 tо 18.01.16), with messages from Herald.

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