I think they will use as much of it as possible so that app developers will be able to easily move to the AppleTV platform.

I would suspect you'll see a new remote that uses Magic Mouse like touch tech and the new development tools will make it easy separate out the visual representation from the control interface.

I would also assume that you'll be able to use an iPad/iPod/iPhone as a remote, or multiple devices for multi-player gaming.

They could port from a touch interface to something like a cross between the Magic Mouse and the Wii controller and/or use your iPhone to interact with the screen.