If you're excited about Natal, and you love Halo 3 then this may be right up your alley.
While not giving specific confirmation, Harold Ryan, head of Bungie Studios, has given us some hope. When asked whether Halo: Reach would be taking advantage of the new technology, he replied "I absolutely think 'Reach' could be enabled with it." He also is apparently very excited about the new Project Natal over at Microsoft.
Guess we'll just have to wait and see. Better get started on your aerobic excercises so you can be in shape...just in case.