Today we are excited to announce Mass Effect 3: Retaliation, a new expansion to the critically-acclaimed Mass Effect 3 multiplayer mode, and our largest upgrade to date! The Retaliation begins on October 9th (October 10th for PS3 in Europe), and will be free to download for PS3, Xbox 360, and PC.

What’s Included in the Retaliation Pack:

New Enemy FactionPrepare to face off against the Collector Praetorian, Scion, Abomination, Trooper, and Captain. Reports have also come in that Cerberus has enlisted the Dragoon to their ranks and the Geth are deploying new Drones to the battlefield.

New Class Kits to UnlockA host of new characters have joined the war to fight this new threat, including the Turian Havoc Soldier, Turian Ghost Infiltrator, with many more being added on a regular basis.

New “Hazard” Versions of Existing Maps
Wage war across six maps, featuring new environmental hazards and traps. A regular rotation of Firebases will be introduced to different hazards as they come under attack. Survive the onslaught of Acid, Lightning, Meltdowns, Sandstorms, Swarms and Whiteouts!

Posted: Oct 04, 2012 1:48 pm
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Source: http://blog.bioware.com/2012/10/04/mass-effect-3-retaliation-multiplayer-dlc/