We haven’t seen any real games when it comes to Project Natal yet, but Microsoft will be remedying this situation at E3 this year.
Microsoft announced that they will be showing off Natal for its world premiere on June 13th and 14th. Hopefully Natal won’t push core games to the wayside at this years E3. Some announcements of some hardcore games, maybe like Gears of War 3 , would definitely be nice.
I don’t think anyone doubted Natal’s presence at E3 though, especially with its current Holiday 2010 release window.