How are you supposed to walk and run with Natal?

[Zlejedi]

People thinking that Natal will be usefull for traditional genres are wishfull thinking only.

Considering lack of input buttons (only way to input something will be gestures)
lack of any movement input ( good luck walking in place during 5 hours long Call of Duty session)
lack of pointer abilities (camera capable of tracking 1cm movement of finger would put this into way too expensive category)

it's rather obvious that Natal games may make Wii Sports look like core gamer Nirvana in comparision.