Well .. MotionTracking for Consoles isn't that new anymore. I guess PS3 is now on the verge of getting 2 seemingly good choices for that. I prefer the one shown on the E3 with the LED-Stick or how one can call it. Its shown accuracy and looked fun.
One thing we shouldnt forget... the best hardware is useless without good games or utils. So i think more important then the hardware itself (so its almost perfect looking) are the games that will make use of those things. And it should make really good use not something like 3 direction shooters or dumb swordplay.
Lets hope and pray they will find good methods of making this work for us.