http://xbox360.ign.com/articles/102/1027989p1.html
and at the Tokyo Game Show several months back gaming greats such as Kojima praised the Natal device and said
"[It's] like the 2D to 3D shift...that was the degree of shock I felt." He even believes the technology could expand beyond games and that "it has the potential to change lifestyle dramatically."
Kojima recognized the ability for Natal to bring in new gamers, but is wary of alienating his core fans. "Casual gaming is going to be quite important," he said. "But core games are also going to improve." Still, he said that "there will be users who will not be able to get used to [Natal]" because they are so used to using controllers right now.