Eh.
It won't be nearly as good as the video shows, just like it was with the Wii.
Everyone thought the Wii was going to be super-precise, but it sucks.
We just don't have the technology for what the video shows, well, we do, but it won't be as easy. There will probably be places where you have to hold stuff exactly, stand exactly, etc.
EDIT:
Someone's gonna be playing Soccer like the chick in the video did, and kick their 360 over or something. LOL.