They're assembling them in Austin, TX. It's optimized for video-ish things. It's a unique case design with some cutting-edge internals. And it's easy for them to upgrade over time (e.g. upping the RAM limits) while a bit of a pain for customers to do so (the Engaget piece says GPUs are upgradeable) - though less than in iMacs.
It fits with their previous efforts (the Cube, the Aluminum Mac Pro) but may have a longer life than them. Smaller is better for them (and us), and the unique design catches eyeballs.
The reviews mention lack of optimized titles. As we know, software almost always lags hardware. I wouldn't be surprised if the $28k+ video app vendors will be happy to sell you an upgrade in very short order that runs very well on this beast.
http://www.bhphotovi...inci_Resolve.html
;-)
Cheers,
Scott.