[nepotism alert: I do work at Microsoft, but not currently in games. However I have been hearing about Kinect for a long time, under the codename Project Natal, whispered around the usability labs with a reverance usually limited to the more deserving nirvana or mecca.]
Moving your body instead of your controller(s) creates a range of viscera that surely denote a million possible magic circles. Sure Wii paved the way and some may continue to like that experience, but this is true evolution. The controller-less interface liberates developers to entertain any possibility for interaction. Select the best aspects, refine them, imagine what’s possible, and what people want that they don’t even know they want.
I have been watching my kid play since digital Santa delivered the magic device: dancing, delighted, shouting AWESOME!! repeatedly, enchanted by the physical experiences enabled by a small black bar, with wonder shouting ‘Mommy, I can fly!!’, nurturing pets and programming hamsters to compliment her in the way she loves. Always, always MOVING! ‘You can do two players and you don’t have to select anything, the second person can just jump right in!’, she crows. Techno-ambivalent auntie is even awed as they play dodgeball with one person controlling legs and another controls arms.
I'm enchanted in a somewhat uncustomary way: gamer-me, parent-me, vain-me (unboring exercise!), citizen-me and educator-me. We’re living in the future, people.
And now we have it, a Kinected WoW. Next time you see me: 30 pounds lighter.