I'll add:
8. full set of options in the package... like webcam, microphone, keyboard, HDMI cable (or the connectivity of the day) etc...
9. customizable user interface
10. voice recognition
11. NAS storage support or remote disk access (to be able to share/retrieve documents like photos, saved games, music etc...)
Also the NAS storage will add a layer of backup and security to the console.
12. bluethooth connection to connect the console to the cell phone and be able to talk through the console... (well... skype everywhere is also an option
)
13. support for touchscreen TV (or devices like the surface device)
14. ability to rip DVD and make a local library which made all the movies available without having to change the DVD (and without doing this through a computer)
well... its all... for the moment