In the 2011 model it is no picknick. You need a big set of iFixit tools for it and a special cable and bracket.
Yup. I put a 750gb Momentus in mine a little while ago (think Fusion drive, but w/out an Apple logo)...turned the (slow) stock drive into a Time Machine, bootcamped the Momentus (250gb Win7 partition to boot straight into Steam Big Picture), hooked up an external 2tb WD Passport as a Media drive, HDMI to a 60" HDTV, and called it a day...but it was a long, stressful, nerve-wracking day
You literally have to *gut* your Mini to get a 2nd drive in, or to swap out the stock one. Plenty of support (vids, walkthroughs, etc) on iFixit, but you're gonna hafta pick up a $75 kit if you go dual drive.
Today's update is decent for anyone who doesn't have one currently, but I don't see a huge reason to upgrade just yet. I'll wait for the next revision.
Note 1: no discrete graphics card option on the new models...not sure how the Intel 4000 benches against my current one, but I doubt it's a night/day difference.
Note 2: 2011 models can also run with 16gb of RAM, so that can be crossed off the "new features" list.
Note 3: regardless of whatever I've written above, upgrading still occasionally crosses my mind...
