Honestly, I don't know what Microsoft is thinking with NATAL, here. This guy seems a hundred percent convinced that this is going to be a revolution in our collective pants, but I'm just seeing an interface for grossly expensive flash games. Wait, I take it back. Even Flash games have a keyboard and can provide a means to navigate, whereas this doesn't even give you the benefit of one analog stick. NATAL's is the kind of interface that goes one step farther, confining developers to either JUST one-screen minigames, or else awkward, non-tactile gestures for movement. I'm sorry, guys, opening my hand or stamping my feet in place in a pretend-march just isn't as intuitive as pushing a joystick forward to go forward. Even for the kinds of things it is equipped to do it doesn't seem all that great since it'll often require a lot of guesswork on the part of the user as to what any given gesture will cause them to do onscreen--especially when it comes to aiming. Without tactile sensation, no matter how good the camera is at picking up motions and translating them to stuff happening on the screen, it's going to feel like trying to stick a key inside a lock in the dark. That's how I see it, anyway.
The other possibility in this thing is trying to find a mix between the controller and the camera tracking, which I'm really iffy about. It's like taking your hand off one controller to put it on another, completely different controller, and if anybody thought THAT was a good idea then we'd have seen freaky two-Xbox 360-controller-but-not-two-player games. Maybe it could track your posture or something? Great, that's just what I want--I'm a fidgety gamer who changes his sitting position every five minutes, and I REALLY want the game to accidentally start up some function just because I crossed my leg. Otherwise what it's got left is voice recognition, which is cool, but we didn't need NATAL to be able to do it.
I just don't get it. This doesn't seem like a product that'll enrich gaming and provide new and interesting interactions so much as a product that brings us the oldest of old interactions with a newer, more gimmicky coat of paint.