eh no. Microsoft hasn't shown any good games yet. (the same can be said about Move) I didn't really want a Wii until after I saw how the motion controls worked with a game I wanted (note, I wanted it for Zelda, but was waiting until I could just walk in a store and get one). I don't want "flail like crazy to block the balls" that they showed at E3. So maybe after E3 2010 I'll be interested, but who knows.
From a technical perspective, I'd like to try it out to see how well it tracks my body.