Here is my prediction:
Apple hasn't upgraded the Mac Mini on Tuesday. With them ramping up this huge production chain in the US I would guess they will use the Mac Pro chassis for the upcoming Mac Mini refresh. It will be like the xMac everybody was dreaming about. Standard CPUs but discrete graphic cards (read: not the mobile chips found on the iMac).
It doesn't work (from a marketing standpoint) to have a $3000 computer look like a $600 computer, although goodness knows the Mini already looks better than anything it competes with.