Like David Cage says, it is very unlikely that Natal is capable of doing several of the things presented in the promo unless A) it costs a good deal more then they sell it for or B) they acquired alien technology 100 years ahead of our own.
To capture a skateboard at HD resolution would require a very high quality camera. What many people forget is that static images look far different then motion images of the same quality. If you look at Youtube in motion it looks OK but stop it at a single frame and it looks horrible.
They show people in a sort of eyetoy esque game where they are interacting with Natal and can see themselves in some of their promotional material and, of course, the people look fine in motion which is probably the case. I don't doubt that, in motion, you can see people on the screen for a reasonable price (a lot of webcams manage this for 30-50 bucks) but I do doubt that an under 100 dollar motion capture camera rig can take high MP images that would allow for input into the game, do decent video capture and have all the hardware to capture motion at speed.
I mean the bit mapping and motion capture rigs used by major studios cost many many times what Natal costs just for that capability alone.
Also Quantic Dream is usually a multiplat developer. Their previous game, Indigo Prophecy, was out on Xbox, PC and PS3. I doubt that he is being fanboyish in his assessment.
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