Apple previews iMac Pro, the most powerful Mac ever built, coming in December
In a rare pre-announcement intended to appease professional users, Apple offered a sneak preview of the new iMac Pro coming in December, boasting up to 18-core Xeon processors and up to 128GB of ECC memory.

Priced at $4,999, the iMac Pro will be the most powerful iMac ever built by Apple when it ships this December. It will feature next-generation Radeon Vega graphics, and comes in a space grey chassis.
With a 27-inch 5K display, the all-in-one machine offers what Apple characterized as workstation-class performance thanks to a completely rethought thermal architecture.

Configurations will include 8-, 10- and even 18-core Xeon processors, capable of delivering up to 22 teraflops. The hardware will boast four Thunderbolt 3 ports that can drive two 5K displays and two high-performance RAID arrays.
Apple says to build a comparable PC would cost about $7,000, but Apple plans to undercut its competitors with a $4,999 starting price. The iMac Pro will begin shipping in December.



Priced at $4,999, the iMac Pro will be the most powerful iMac ever built by Apple when it ships this December. It will feature next-generation Radeon Vega graphics, and comes in a space grey chassis.
With a 27-inch 5K display, the all-in-one machine offers what Apple characterized as workstation-class performance thanks to a completely rethought thermal architecture.

Configurations will include 8-, 10- and even 18-core Xeon processors, capable of delivering up to 22 teraflops. The hardware will boast four Thunderbolt 3 ports that can drive two 5K displays and two high-performance RAID arrays.
Apple says to build a comparable PC would cost about $7,000, but Apple plans to undercut its competitors with a $4,999 starting price. The iMac Pro will begin shipping in December.



Comments
The *biggest* complaints from the pro market all revolve around the perceived lack of customizability and expandability of the current Mac Pro.
So what does Apple do? They make one that will undoubtedly be even more proprietary and harder to customize and/or expand.
This, to me, is further evidence that Apple's current "pro" products are really just high-end enthusiast products that happen to work for some professionals.
But we'll see. It certainly looks like it will be a beautiful piece of hardware!
What they didn't want is not have an upgrade path other than a 2013 machine. If they refresh the iMac Pro every year that would work out very well for many pros.
Wait until the new Mac Pros are announced.
Considering the drip-drip from Intel, meaningful updates may only be every 2 years. Still not bad considering it beats 4 years.
I'm equally amazed people think "avid hobbyist" (AKA know as upgradable) means "pro".
High Sierra, this iMac Pro and the upcoming Mac Pro. NOW we're talking!
18 core Xeons and an optimized OS! Mac Power Users rejoice!!!
Now I really wonder what Tim has in store for the upcoming Mac Pro. Dual 18-core Xeons?
This is a solid machine for many that want that maximum performance with zero hassles. It will sell like crazy. Heck, while I love my 18-month-old 5K, quad-i7 with 64GB on it, I may still buy that new iMac because I can always use the extra horsepower and keep everything integrated.
Damn that's a sweet machine. It covers everything I longed for in my current iMac. Good for Apple. I look forward to the reviews of that high-end iMac when the time comes.
Tim Cook did reiterate his support for the Mac Pro, so it may very well cover whatever needs you apparently need.
There are plenty of pro's that use PCI-equipment for audio or video editing/creation for example. With the previous Pro desktops you could buy a PCI card and basically integrate a lot into your desktop, inclúding a new GPU, better/bigger HD's and SSD's, and more ram. With the current Mac Pro and the to be-released iMac Pro, that's just not possible.
@Steven N: I know avid hobbyists usually care less about upgradeability. But don't you think a pro usually tends to spend more on devices than these hobbyists? This iMac Pro (it ís a "Pro" segmented device/name) is 33% more expensive compared to a Mac Pro, is pretty much equally as not-upgradeable, and ment for hobbyists?
Hell, I could probably work straight off 10GbE 99% of the time and stay productive.
I love the Black Mac.