The remote and the mouse are going to be the exact same thing. Anyone using the iPhone Remote app is pretty much already using the same thing they'll be getting with this change.
Actually, that might make a good app: with the camera on the back of an iPhone (or nano, or future Touch), you could theoretically use it as a mouse. Use the screen/wheel as a click, and connect over bluetooth or wifi, and Bob's your Uncle.
Even an out-of-focus image would be easy to use to tell directional movement of the phone - as long as there was a little bit of light getting under.
(I'm not saying this is their plan, just that it's pretty trivial to do if it were useful)