The Witness is going to release to the next Xbox too, I think.
I'm guessing Xbox will have pretty similar stuff. Third party games of popular gritty franchises, kooky titles (some Kinect, some not). Possibly some surprises, like some big first party titles. We'll see Kinect on display just as Move was. Though I gotta say, the Move demo was really weird. It was like the Wii Music presentation all over again.
The big things I want to learn from the Xbox presentation are:
• The new Xbox controller, and how it compares to U and PS4
• Backwards compatibility - if any
• XBLA innovations
• Kinect 2 - yeah yeah, I'm actually interested in Kinect. Deal with it.