Spec wise, you’d do well to build an equivalent machine for the same price. Software, it will run anything a current Mac will run. The New APIs are obviously (given the demos) already in the hands of some major players, and I’m sure there are some developers who are already scrambling to get some AR ideas into play so they can be available for a few Million users who will, if they can run iOS11, be able to run it when iOS is released this fall.
Was WWDC a original iPhone/iPad reveal? No. But it’s obvisous that they’ve been burning up a lot of candles. iMac Pro is top of the line now, I look forward to seeing what they do to update the Mac Pro.
At least you wouldn’t be stuck with the Apple version of real software.