We've known that we'd need some space for Kinect, and we've heard all kinds of numbers flying around, but now Kotaku report that they've been given pictures from the peripheral's manual that shows exactly how much it will expect of our homes. If these pictures are real, it'd mean we'll need 6 feet/1.8 meters between the TV and the sofa. We'll also have to move any tables out of the way.
Want to be more than one player? Expect to have 2.4 meters to spare. The manual is also giving players the advice to wear clothes that contrasts more with the background if the camera has problems picking you up.