One of the new "features" not mentioned here is that the iMac Pro is no longer user-serviceable. The screws to open the back are gone, and you can't replace the RAM and, presumably, the SSD. For a $5000 Pro machine, that's disappointing.
You've confirmed this truly not user-servicable?
(edited typo)
https://www.apple.com/v/imac-pro/a/images/overview/storage_large.jpg
> Brownlee got a chance to play with the new 10-core machine for a week, and while he praises the speed, he notes that the iMac Pro isn’t user upgradeable. Even the RAM door that is on the back of the 5K iMac is gone, which will surely upset power users.
9to5 also reported that back in June, claiming confirmation from Apple.
That's an understatement.
Maybe the Mac Pro will be better.
It also wouldn't come with a built-in display, which would allow it to have a slightly better spec for the same price as an iMac Pro.