1up: Microsoft's approach to motion control is a unique one. Rather than use a traditional controller, they've opted to create a system that allows users to interact with games using gestures and spoken commands.
We were given a glimpse of the peripheral's potential during E3 2009, when Microsoft introduced the world to "Milo." Details have been sparse since then, but we should know much more following Microsoft's special Natal event on June 13.
Until then, here's a summary of what we know. Keep an eye on this space for updates on the official release date and pricing information during E3!.