I'm not impressed at all. All they showed off was Wii crap with beefed up graphics.
As for controlling the xbox without a controller, it looks interesting. I don't like how they have you hover over an item you want to select and wait for the circle to fill up. If it was like Minority Report, I'd be excited for it.
And that Natal Star Wars on rails game looks like it could be fun. Hopefully what they showed off was just a really rough demo, and not what the final game will look like. Still won't be enough to get me to buy a Natal though.