Assassin's Creed : Project Legacy - Season's Greetings Trailer

Game - Assassin's Creed : Project Legacy
Publisher - Ubisoft
Developer - Ubisoft
Platform - Facebook
Released Date - 30 September 2010

Source
http://www.youtube.com/user/AssassinsCreed

Guitar Hero : Warriors Of Rock - Merry KISS-mas Trailer

Game - Guitar Hero : Warriors Of Rock
Publisher - Activision
Developer - Neversoft
Platform - PC, 360, PS3, Wii, NDS
Released Date - 28 September 2010

Source
http://www.youtube.com/user/GuitarHeroGames

Operation Flashpoint : Red River - Sgt. Damien Knox Bio Trailer

Game - Operation Flashpoint : Red River
Publisher- Codemasters
Developer - Codemasters
Engine - EGO 2.0
Platform - PC, 360, PS3
Release Date - TBA 2011

Source
http://www.youtube.com/user/flashpointredriver

Ace Combat : Assault Horizon - Happy Holiday Trailer

Game - Ace Combat : Assault Horizon
Publisher - Namco Bandai
Developer - Project Aces
Platform - 360, PS3
Release Date - TBA 2011

Source
http://www.youtube.com/user/NamcoBandaiGamesEU

Dead Space 2 - The Excavations Trailer (Extended Version)

Game - Dead Space 2
Publisher - Electronic Arts
Developer - Visceral Games
Platform - PC, 360, PS3
Release Date - 25 January 2011

Source
http://www.youtube.com/user/eavision

Dead Rising 2 : Case West - Launch Trailer

Game - Dead Rising 2 : Case West
Publisher - Capcom
Developer - Blue Castle Games
Platform - 360
Release Date - 27 December 2010

Source
http://www.youtube.com/user/CapcomUnityVideos

DC Universe Online - Group Combat Alerts : Area 51

Game - DC Universe Online
Publisher - Sony Online Entertainment
Developer - Sony Austin
Engine - Unreal 3
Platform - PC, PS3
Release Date - 31 March 2011

Source
http://www.youtube.com/user/DCUniverseOnlineGame