Well, as of now, you can actually do connect your phone to the apple tv[1]. And you can connect a BT Keyboard as well. And I think I've also seen games utilizing the second screen for a different purpose then simply for mirroring.

I'm not so sure about the touchpad though.

Still I find that page a little bogus.

[1]: http://www.apple.com/iphone/features/airplay.html