Patch/4.x

Patch 4.3: Hour of Twilight

Patch	Release date (US)	Version	Interface .toc	Highlights & notes
Patch 4.3.4	April 10, 2012	15595	40300	New bug submitting and player reporting interfaces
Patch 4.3.3	February 28, 2012	15354	40300	Bug Fixes
Patch 4.3.2	January 31, 2012	15211	40300	Cross-Realm Raids Minor Class Balance Fixes Beta 64-Bit Client Bug Fixes
Patch 4.3.0a	December 2, 2011	15055	40300	Bug Fixes
Patch 4.3.0	November 29, 2011	15005	40300	5-man Dungeons : End Time - Well of Eternity - Hour of Twilight Dragon Soul raid Transmogrification Void Storage Raid Finder Darkmoon Island

Patch	Release date (US)	Version	Interface .toc	Highlights & notes
Patch 4.2.2	August 30, 2011	14545	40200	Firelands Ragnaros visibility enhancement Raid UI enhancements Multiple accounts players fixes
Patch 4.2.0a	August 8, 2011	14480	40200	Bug fixes
Patch 4.2.0	June 28, 2011	14333	40200	Firelands raid Firelands Invasion daily quests [Dragonwrath, Tarecgosa's Rest]

Patch	Release date (US)	Version	Interface .toc	Highlights & notes
Patch 4.1.0a	May 5, 2011	14007	40100	Bug fixes
Patch 4.1.0	April 26, 2011	13914	40100 (api)	Zul'Aman and Zul'Gurub return as level 85 5-player heroics

Patch	Release date (US)	Version	Interface .toc	Highlights & notes
Patch 4.0.6a	February 11, 2011	13623	40000	Bug fixes
Patch 4.0.6	February 8, 2011	13596	40000	Tooltip fixes Class changes
Patch 4.0.3a	November 22, 2010	13329	40000	New zones, new quests, new combos
Patch 4.0.3	November 16, 2010	13287	40000	Additional preparations for the release of World of Warcraft: Cataclysm. Bug fixes User interface changes Background content download for the impending shattering of Azeroth
Patch 4.0.1a	October26, 2010	13205	40000	Bug fixes
Patch 4.0.1	October 12, 2010	13164	40000 (api)	Talent tree changes Blizzard Launcher update Reforging Flexible Raid Lock System [Justice Points] and new Honor Points Lots of UI changes
Patch 4.0.0	June 30, 2010	12319	40000	Beta testing.
Patch 4.0.0	August 21, 2009	10287	40000	Alpha testing. BlizzCon 2009