Be really nice if they made the mini a screenless MacBook Pro, but with a 3rd USB, 2nd FireWire, full DVI and 1 PCIe card (even if these means doubling its height). Of course, what we will get, if anything is a computer about as good as a base macbook, sans screen that is hard to justify.
It would be nice if they made it warm and furry and able to jump in your lap and wag its tail too but then who would buy a dog?
Product placement in their line is paramount. Some of the battles in IBM over what product group would release what products and what degree of 'crippling' would be demanded to save other division products were probably bloody and yet oddly necessary. Think, a small Mac Pro. Who would buy the full-sized Mac Pro? The bleeding from the sales of the Mac Pro wouldn't make the bean counters happy and could spell the end of that line. Especially in this economy.
A speed bumped mini with more memory capacity would be a great idea. It's an entry level system. Think training wheels and a hard plastic seat, not Concorde in a shoebox..
They could do the AppleTV top for it??? Maybe add some blinking lights? A disco ball?