I expect full game support for the (much improved) Kinect 2.0. My daughters love Kinect and are really excited for the new camera and games...(A BIG reason for my choice) in getting the XBox One at launch.
I love sports and am a huge NFL fan and love the NFL deal with MS, and expect the support to continue yearly.
I love that I can plug external devices with snapping features and expect that it works well and they expand on this.
I get all of the above plus internet, blu-ray, music, and a robust amount of aps.
To top it off I can play amazing first and third party games and EXPECT them to continue to deliver quality titles year after year.
The 22nd can't come fast enough!