Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
There's few reason to believe the 5.400rpm hard drive is not SATA and thus upgradeable.

There's much reason to believe, the LPDDR RAM and PCIe based Flash aren't readily available parts.
 
Looking at the iMac ram specs, it says:

SODIMM slots user accessible


Looking at the new mini ram specs, it says:

Configurable only at the Apple online store
 
They're still using HDD's, so I'll simply take a guess that the HDD remains an "off-the-shelf" SATA 2.5" drive. I could be wrong.

Insofar as RAM is concerned, the Mini's enclosure looks all-but unchanged (except for the change of the firewire port to a second thunderbolt port), and I would reckon that the bottom still has the circular plastic plate that comes right off.

If there are not still two DIMM slots inside, I'll guess that that sub-assembly that previously contained the RAM slots, now is a sub-assembly with soldered-in RAM in place of those (previous) slots....
 
I'm starting to wonder on this too. The theme of this gen seems to be the reusing of old parts. Why make a whole new/different mobo for what feels like a side grade? Perhaps they just want to discourage our opening it up.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.