WoW's Patch 5.0.4 Release Notes Now Available

World of Warcraft's
final pre-Mists of Pandaria content patch has gone live,
introducing a new World Event (Attack on Theramore Isle) and a host of
fairly significant changes to existing systems. Some noteworthy examples:

the majority of earnable Achievements, pets and mounts will be made
account-wide instead of per-character. area-effect looting, which has been around for a while in other games,
makes its debut. the slot for relics, ranged and thrown weapons has been removed. Ranged
weapons have had their damage output increased and their minimum range
removed to compensate. a new talent tree system all characters now take 40% less damage from other players

A number of players have been experiencing difficulties downloading the patch
and difficulties logging into the game after patching due to server
congestion. Reception to the patch has been mixed.

Source: Battle.net