I'm still waiting for them to be able to let an iOS device act as screen/input device for a headless MacMini or similar "home server" box.
There are plenty of 3rd party remote apps that already provide this functionality. In fact, I'm using HippoRemote and Rowmote on my ipad and ipod touch to control my MacMini HTPC. Mouse functions, keyboard input, etc. all from my iOS devices. Very convenient.