I still get amazed at some people here that keep throwing rocks at Apple for their decisions.
I'm also amazed at their "apologizing" on the nMP but it will mean squat in the end.
This was just a "wait, we're still here" but you can bet your @$$ that you will not get whatever PCIe slot count in the new mMP. And where do they say it will come next year? You won't see it this year, that doesn't mean you'll see it next year either.
I'm still divided as to they had an upgraded model that has gone to the trash, or that they just woke up and started a new design now from scratch. The former seems likely but I don't see them dropping the ball just like that, if power/heat was the issue a solution would come up for sure. The latter also seems likely, after reading the apology.
So, whatever happened we're still far from a ready model.
I'm considering the 8core, and although the price came down, it's still a lot of money for a machine you don't know what kind of future support it will have. Will it work with 10.13 right out of the box? No GPU issues?
In the mean time no appropriate display for it as well. The new one to come is still far off and it will be TB3 for sure - or TB3.1 if Intel updates the specs to include DP1.4.
The new mMP will have to be 1S (still betting on SKL-W) and I wouldn't see them going back from the dual GPU solution, although they admitted that many people don't need it. I believe applications will be optimized for dual GPUs and by next year there might be gains finally.
But they still want to control the platform, forget PCIe cards. They won't do it. Too many things to consider, a support nightmare. They don't see the nMP as a machine for geeks and DIYs, much on the contrary. Those can go PC or Hack.
Being in the lower % digit (and although it still makes them a lot of money I'd guess) they can't afford or want to have a machine that gives them support issues.
Remember, we can solve most of our issues (drivers, whatever) but that's not the case for (most of) the other Mac buyers out there.
Now, the (i)MacPro could eat into the lower tier of the Pro lineup - Xeon E3, EC RAM. That would leave room only for a higher end machine. But that's not the way Apple has been going and I have a hard time seeing what will become of the MP.
I guess now they really have to re-design the nMP (too bad) but don't count on being expandable meaning user upgradeable standard cards - I very much doubt it.
They'll have a hard time coming up with a new solid design (after the nMP) that will be flexible enough so that you can choose to use 1 or 2 GPUs (I'm already not considering dual CPUs, that road is closed I guess). Major design overhaul required. And some guys will jump right at me but I don't think a tower like design is coming back.
I could see a come back of the NeXT Cube. Well, maybe not a cube but some sort of stylish box with a custom mobo that can take custom GPUs that you hook up (or not) according to your needs. But I wouldn't see more than 2 of those.
Forget ATX, DIY just plug in PCIe cards, even standard SSDs I doubt will be used. They still don't want you to tinker inside your Mac.
Am I just being pessimist? Maybe, but prepare to wait a long time and be disappointed if you want any of this.
Most won't like this comment but I believe they should have given the nMP another try this year, with SKL-W and new GPUs (even if power constrained) and TB3 with a new display. See how it would go. I believe geeks like us are going into oblivion and now people want a powerful enough machine that just works and offload tasks to other non-Apple stuff.
But that's just me drifting...