Apple should certainly be in for discounts even if they didn't upgrade the Xeon W CPU - the new chips are cheap but they must sure get a similar discount on the existing ones in the iMac Pro if they were choosing not to refresh that.
The only good reason for Apple to skip W 2200 is if Apple was going to jump to a W 2300 in ( the 10nm versions coming in the second half of 2020) and had highly limited resources to get out a firmware upgrade. One of Apple's major problems though is that they "don't care about Pros". Leaving the iMac Pro pragmatically comatose for almost 3 years isn't going to help them. Apple's standard practice is that they don't do substantive price drops without some substantive change. Going to W 2200 series would be the fig leaf to lower prices on a aging implementation.
iMac Pro already has SSD only and the cooling design.
Intel is selling their 14nm stuff as fast as they can make it. As get lower down in the line up, I don't think there is going to be a major change. Intel's market ups in the highest -X , Xeon W , and Xeon SP space were huge. Those first two are where most of the costs are coming. A bit less so on the SP. But mainstream Core i the competition impact is going to be lower in terms of dollar amounts. And Apple "rounds up" products to $__99 so they put double digit padding in all the time. So if double digit comes out of a component Apple is just as likely to pocket that as pass it on ( hence keep the trailing 99 on the price point. ). To seriously push Apple end pricing have to get to the third digit to get clear of all that "99" stuff.
Except that Apple has just rolled out lower refresh rates ( for 'film' work ) on the
new MBP 16" and on the XDR.
"... Refresh rates: 47.95Hz, 48.00Hz, 50.00Hz, 59.94Hz, 60.00Hz "
( some of those are 2x of what film does or some mutliple or variant of equipment in that space).
That is probably something iMac Pro could track to with an spec bump that was more firmware upgrade.
Pro-motion on iPad Pro is more about smoother scrolling of static 2D text/images than in chasing the gaming frame rate (and synchronization ) wars. Apple is unlikely to chase after the latter. So if that is what is pounding the drum here on iMac feature, then it is probably weakly motivated.
the iMac Pro doesn't need to get more pricey. It needs to get more affordable or minimally stay the same (with better stuff). One thing that Apple could do is put a "mere mortal" 6K display in the iMac Pro. ( make the internal volume bigger.), but don't put the XDR on it ( just what the color space have now to keep price controlled). Then they could shift the CPU more to the center and the GPU further to the side since more now . That could enable adding back in the RAM door. ( and perhaps putting a second 10GbE socket on it with more room for that to spread out also to manage thermals. )
What Apple has been doing is lower rates in mac Pro systems; not higher ones.
The problem there is that Apple has historically put barely mid range GPUs on the 21.5 - 24" range systems. Cranking up budge cost sensitive GPUs to 120Hz probably isn't going to work so well.
If drive the standard configuration 24" iMac into the 27" pricing space that is likely to run afoul of the price range segmentation that Apple typically does. And duplicating the iMac Pro with two screen models.... probably isn't going to happen for the same reasons ( i.e., a iMP 24" model coming down to sit on top of the upper 27' price point. )
It doesn't look like there is going to be an Ice Lake S CPU. Perhaps there will be a Tiger Lake S , but most of the Ice Lake era will get covered in the desktop S range by something from Comet Lake ( which is 14nm and same old iGPU. ). Comet Lake S is suppose to get to 10 cores and could be used for a iMac if the thermals hold up. That is another reason why the iMac Pro setup on CPU pricing since it needs to at least keep the same entry price and go to 10 core minimal.
Frankly, Apple switching to AMD for the 2020 iMac upgrades would make at least as much sense as sticking with Intel. Apple should be in now way reigned in by "Ice Lake S" limitations at all for the iMac updates.
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I agree with the statement that Apple will need to retain credibility with the professional crowd by not abandoning the iMac Pro for more than 2 years. Certainly, keeping such a thing on sale for 6 years unchanged like the Mac Pro 2013 would be a massive mistake, especially if compounded by keeping the price the same.
The simple thing to do is double the NAND storage or offer better graphics as standard - an effective sales boost without re-engineering.
Apple switching to AMD sounds incredibly unlikely even with Ryzen 3 and Threadripper stuff on the horizon purely on the basis that relative benchmarks would be seriously upset and Apple would need to change every SKU and they only do that sort of thing with form factor changes.
And yes, Apple are just about at the end of an era with both Macbooks and iMacs right now. They'll risk losing Thunderbolt which is a big reason for sticking with Intel even though a royalty free implementation is supposedly opening the door to AMD. Maybe they'll go "USB4" and ditch Thunderbolt?
The 6k screen needing its own cooling solution should stand against putting it into an iMac without a redesign to keep the important computer bits away from the nasty heat.
120Hz (and higher) is common in a lot of gaming monitors, even ones with IPS screens. Obviously Apple won't be considering gamers but Pro-Motion (where the screen becomes more responsive to redraw) could be a better option than simply hitting up ever higher resolution retina displays.
Offering lower fixed refresh rates is a step towards power saving in laptops in my opinion, nice for video editing where refresh rates can exactly match footage which would be hugely useful.
What could be interesting is the use of Catalina's Sidecar feature to allow a compatible Mac to use an iPad as a second screen. That second screen might have Pro-Motion mode if an iPad Pro.
The Navi graphics parts appear to be more than just minor performance bumps, yes they might be forced to do more work driving a 120Hz display, but that's 100% more pixels to shift in a second vs 44% for a 6k panel over a 5k panel at 60Hz.
Apple decide what's 'adequate' for their GPUs - and gaming has never been on the list of things to pay attention to.
My point about what Apple would do with CPU discounts, cheaper NAND, and higher performing node shrunk CPU and GPU is relatively simple - Apple won't reduce prices but will bump specs up. There's the possibility of tariffs that could be absorbed by Apple for a time but in my opinion they should not waste time getting rid of spinning disks in favour of all-SSD lineup.