General
* Rally points now behave as a move command, instead of an attack move command.
* Enabled the ability to manually add a StarCraft II character friend using the player's character code. Character code is a server-assigned numerical code that is displayed within the Add Friend panel.
* Battle.net Achievements & Rewards have been updated.
* All Quick Match modes are now available: 1v1, 2v2, 3v3, 4v4, and Free For All.
* All A.I. difficulties are now available for play.
* Cooperative matchmaking versus A.I. players is now available as a play mode.
* Enabled cross-game social features between World of Warcraft and StarCraft II.
Balance Changes
* ZERG
o Infestor
+ Frenzy spell removed.
+ Infested Terran spell added.
o Overseer
+ Infested Terran spell removed.
o Ultralisk
+ Now immune to stuns and mind control.
Source: US Starcraft 2