So, I went ahead and bought the new, high-end Mac Mini. I got it with 16GB RAM and the 512GB SSD.
Like everyone else, I hoped that Iris Pro would be an option, but I guess not. That's okay, though...it's a LOT better than the old PowerMac G5 Dual 2.0 that I've been using for 8 years (talk about PAIN...lol).
I believe that the new Mac Mini uses the Intel i5-4278U processor which, according to the Intel website, is only capable of addressing a maximum of 16GB of RAM. Although I haven't seen confirmation on whether or not the RAM is soldered, upgrading to 16GB of RAM didn't seem to be that much more expensive than going with 3rd party aftermarket RAM (assuming that the RAM is user-upgradeable). OWC sells a 16GB Mac Mini upgrade kit for round $160. For $200, I get Apple warranty-backed memory. I'm not going to quibble about the $40 difference.
The SSD wasn't much more, either. OWC sells a 480GB SSD for around $260. For $300, I get the 512GB Apple SSD and I don't have to risk damaging the machine or voiding my warranty...all for only around $40 more.
I might be doing some transcoding/conversion of existing AVCHD home movies, so the conversions won't be as fast as if I had a quad-core processor. But, once that project is complete (several weeks to months), I won't really need the raw power of additional cores.
For those folks who are mad about Apple eliminating the quad-cores (e.g. folks who need power, but not fast graphics), I say find a refurb or a used 2012 machine on eBay. Problem solved. If you're looking to do more graphics-intense things, go with this machine. And, if you're looking to do both (a "power user"), you'll probably want to look to an iMac or a Mac Pro.
As was reiterated at today's presentation, the Mac Mini is an "entry-level" Mac. They're not going to make these headless iMacs (with discrete graphics), since they don't want to start cannibalizing sales of iMacs. They want to keep the price low.
The 2012 Mac Mini had crappy Intel 4000 graphics. If I went with a MacBook Pro, the same specs would have cost me $450 more. An iMac did not interest me, since I already have a pretty nice 24" (1920x1200) display. And, a Mac Pro was totally out of the question, due to its price.
So, all in all, this should work out pretty well.