Given that Apple believes thin is in, I'd expect a redesigned mini to be thinner, like the illustration zombitronic posted. I don't think there will be 3.5" hard drives, discrete graphics or more memory slots, so a reduction in size is to be expected if it's redesigned. And if it's not being redesigned, what the heck is taking so long?as has been said over and over in this thread, it is pointless to make the mini smaller unless you can provide at least some of the key elements we are mostly looking for, ie, memory and video (not to mention faster and larger hard drives).
I've been expecting a simple speed-bump upgrade to the mini for a couple of months now. But since it's so long overdue, I now think there might be more than just a speed bump, although nothing will happen until after new MacBooks come out.