From Daring Fireball, "The Mac Pro Lives":
Let’s not beat around the bush. I have great news to share:
Apple is currently hard at work on a “completely rethought” Mac Pro, with a modular design that can accommodate high-end CPUs and big honking hot-running GPUs, and which should make it easier for Apple to update with new components on a regular basis. They’re also working on Apple-branded pro displays to go with them.
I also have not-so-great news:
These next-gen Mac Pros and pro displays “will not ship this year”. (I hope that means “next year”, but all Apple said was “not this year”.) In the meantime, Apple is today releasing meager speed-bump updates to the existing Mac Pros. The $2999 model goes from 4 Xeon CPU cores to 6, and from dual AMD G300 GPUs to dual G500 GPUs. The $3999 model goes from 6 CPU cores to 8, and from dual D500 GPUs to dual D800 D700 GPUs. Nothing else is changing, including the ports. No USB-C, no Thunderbolt 3 (and so no support for the LG UltraFine 5K display).
But more good news, too:
Apple has “great” new iMacs in the pipeline, slated for release “this year”, including configurations specifically targeted at large segments of the pro market.
First of all, I just want to say: totally called it. Craig Federighi admitted that with the redesign of the Mac Pro back in 2012, they'd basically designed themselves in a corner (at the very least thermally). Apple has always walked a fine line in prioritizing design over functionality, and with the latest iteration of the Mac Pro, they crossed it. This isn't the first time in the history of the company that they've done so, nor will it be their last. The important takeaway here is that they still appreciate the importance of the Mac Pro user base and they're listening. Can't wait until 2018.