Isn't TrueTone just the DCI-P3 Wide Color Gamut? The iMac 5K has had that since the initial model.
FaceID needs a T2 chip and the T2 chip does not work with Fusion Drives. So until the iMac sheds the spinning disk option...
And while I would love to see the iMac adopt the iMac Pro's thermal system, that would mean no more (easily) user-replaceable RAM and this forum would go up like a supernova if that happened.
As for a 31.6" iMac launching at WWDC - that idea died this morning.
If my memory serves me correct, P3 appeared in 5K iMac not immediately, but a year or two later after its premiere in 2014.
What about T2, then in my opinion these 21.5 and 27 models will not soon fly away from HDD and Fusion Drive and it remains to hope that the new iMac of future will be positioned as a new product branch already with the SSDs in the standard, while the current models will remain like the Last Star Fighe..ups, i mean the non-Retina models are holding up now.
And yes, if I were Apple and continued their policy, then on such a happy occasion, I would close the user access to RAM

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While the display is physically gorgeous, one of few 5K displays out there, and the price difference between iMac 5K and Mac mini with 3rd party display is extremely compelling, I wouldn't go as far as as say its industry leading.
- No HDR support
- About twice as slow response time than more modern displays
I do not know how it turns out, but at 21.5" iMac 2017, I easily watch the HDR movie. And I have something to compare with, for example, the 27" iMac 2013 Late showed same movies with gray and discolored (something like RAW photo with no correction). But for another example the LG TV with the official support for HDR shows this HDR content as it should. And 21.5" iMac shows same content in the same way, and sometimes it seems to me better than TV. Maybe this is a somekind built in fake-HDR support, but this is a really good fake-HDR.
But I agree with the claims, and if Apple continues to consider itself a breakthrough company, now it’s time to improve the display again. Maybe with Mini LED-like backlight