Twitter | Aaron Greenberg
900p (1600 x 900) upscaled to 1080p (1920 x 1080).
Confirmed now is Forza 5 at 1080p/60fps, Ryse at 900p/30fps, Killer Instinct at 720p/60fps and unconfirmed is Dead Rising supposedly having a dynamic resolution at 30fps.
So there you have it.
Killer Instinct at 720P and Ryse at 900P. Xbones weak GPU is showing.