UPDATE #1: In addition to Crackdown, so far we've found:
??? ended up being Project Spark, Below and Kinect Sports Rivals (Rare).
The Trending tab with two possible games (look at x friends/people played) | Project Spark and D4:
UPDATE #2: More photos thanks to TheVerge and Engadget, including a close up shot of a second possible
UPDATE #3: Rare comments on 'Knight' image (highlighted in UPDATE #1) and Quantum Break confirmed:
And finally there's this (D4):