After all, the first concern is selling units, and the truly innovative stuff happens after games and gamers have been observed. Even something like Super Mario 64, which certainly innovated in 3D platforming, built on other, earlier 3D or semi-3D games. The developers think you’ll see a lot of game+ releases, like say Tony Hawk with some extra functionality built-in, before you get games that are really living in the new control scheme.
Personally, I’m excited to see stuff move beyond the analog stick and/or cursor. That makes Natal the most interesting to me, but in the end it’s the games that will decide things.