Good news: the Mac Mini is back! Bad news: there's no way you're going to be upgrading the RAM yourself.
It's perhaps not massively surprising. Apple hasn't been making products any easier to upgrade, and given the small computer is essentially a MacBook in a different box, we aren't too shocked. But the old Mac Mini was surprisingly easy to upgrade, so it's a shame that's had to change.
If you want more RAM, you'll have to either buy a higher-end model or a custom order with more RAM. Both, sadly and predictably, more expensive than adding the RAM yourself. [MacRumors]