Link!
http://www.youtube.com/watch?v=jAsvdZs7REs&feature=channe l_video_title
For the first time ever, see Halo 4 in action as we take you behind the scenes with the developers at 343 Industries. Enjoy your first in-game look at the Master Chief, the updated Battle Rifle, and the exciting multiplayer spaces coming your way holiday 2012.
[Edited on 03.05.2012 8:47 AM PST]