Turning Point: Fall of Liberty
http://xbox360.ign.com/objects/851/851206.html
http://en.wikipedia.org/wiki/Turning_Point:_Fall_of_Liberty
FPS game that's supposed to come out end of next month, which I think sounds really interesting. It's set in an alternate timeline where the Axis forces had taken over Europe and are launching an attack on the US.
While I'm normally not a fan of FPS games, I think this one sounds neat - alternate realities are always a fun thing, plus the fact that your character is not a soldier but just a regular guy, and you're not fighting to win the war, just to survive it.
Sounds pretty cool, I think (certainly different from what you usually see), and I'm currently in the process of downloading the demo from Live.