1. More precise/realistic physics
2. Better A.I. On both ends, meaning partner A.I. and enemy A.I.
3 Stream all video/music files from pc or play from external harddrive/thumb drive
4. Kinect Support (or similar), and the same motion controls as wii/ps3, normal controller, and a wiiU like controller(I like it)
5. Full Browser support (with Flash)
6. Unified friend list across all games. A unified capable matchmaking service across all games.
7. No requirements to install games
8. Multi Screen Support (Up to Three)
9. 3D Support
10. Built in memory so need for a separate memory card for saves.
That's all I could think of for now.