Thanks for the explanation. I didn't know that. It makes sense that Apple wouldn't want to make a separate logic board for the high end quad-core if it may not sell as much. Too bad.
Yeah, hopefully it returns, but that seems to be out of Apple's hands from a practical standpoint. It hurts not only from the multiprocessing standpoint but also because the dual-core i7 doesn't have Iris Pro.
The RAM stuff meanwhile seems pretty indefensible, although given that the mini has always broadly been a desktop version of the 13" MBP I wonder how much of it is supply and scale stuff as well. On the other hand, replacing the easy access with pentalobe screws speaks against that more charitable explanation.