Making a prediction here. The next Mac mini’s will be really small. Think, Macbook Air small. Just sit and think for a moment. Put in an SSD drive, remove the super drive, and you have a really small, tightly compact computer. I imagine you could cut the size in half. Just a bit larger than the 2nd generation AppleTV.
I’d love this. An ultra small desktop computer that I can bring with me? A portable development server. I don’t think this is unreasonable, what with Apple’s push toward making everything smaller. SSD drives are getting cheaper, and they have that market locked tight. With a move away from super drives, I can foresee removing them from the Mac minis. You could always buy the external if needed, but I imagine they’ll suggest you won’t. After all, media you get from iTunes, and Apps you get from Apple’s App Store for Mac.
So yeah, that’s my prediction.