They officially announced the new XBOX today. It will be called XBOX ONE. The new console will have 15 exclusive titles in the first year. It also appears to have a newer version of Kinect.
It will have a new XBOX TV function that will provide exclusive, game related programs. (Think mini episodes of Halo Directed by Steven Spielberg) Plus they have made a deal with the NFL for future content.
XBOX ONE will launch later this year, but there is still no official date.