Is Gears of War Kinect an on-rails shooter?

The much-rumored Gears of War Kinect title is roping in more speculation, with latest reports claiming the game will be an on-rails shooter. Kotaku has gotten hold of a leaked image of a supposedly early build of the game, showing Marcus touching his ear piece to talk, and the player doing the exact same thing.

A source has also told them that this early version includes assets and events from Gears of War 2, and that players movement will be on-rails. It’s hard to imagine how an on-rails shooter will work on a controller-free device (gun-fingers, anyone?), but we’re still excited to see the results.

How would you implement Kinect into a Gears of War title?