lets see
343 Industries: Halo 4 most likely, probably be a teaser/trailer at E3 release xmas 2012
BigPark: Kinect games
Good Science Studio: Kinect games
Lionhead Studios: A new IP inspired by uncharted by the sounds of things and hopefully a new Black & white games, come on if any game is perfect for the Kinect it's this one. Don't expect anything other than Fable 3 PC this year and some DLC, I doubt anything big will come in 2012 ether though they usally release a game every 2 years but a new IP will probably take longer, we may see a smaller XBLA game possible bassed on Milo & Kate tech.
MGS Mobile Gaming: Windows Phone 7 games
Rare Ltd.: Kinect games/Avatar related products
Turn 10 Studios: Forza 4
Xbox Live Productions: XBLA titles and general XBL development
Microsoft Games Studios: Microsoft flight for PC
And that is what they are working on...