i've been whining about the ipod not being able to have its own sound level for the sleep timer (so that alarm clock would be louder and wake me up). so that's definitely what I want as I always listen to music when going to bed/waking up.
another thing what might be cool is airport express on dock. it would boost up Express sales too..
my third idea is also a wireless remote as JFreak suggested. it would be cool to have the remote anywhere, because now you have to place it somewhere between the ear bud wire.. and because the wire is pretty long already, you'll end up having a stupid wire hanging and disturbing you all the time.