I got to play the Natal Ricochet game this summer and I must say that it worked flawlessly. The only thing that didn't feel natural was the response time, which they said they were trying to improve.
Maybe, but performing well in controlled press tour and demo environments is very different than performing well in a million different kinds of living room and lighting configurations. I'm not saying the tech is going to utterly fail, but these things typically do present a lot of problems for computer vision technology.