The MCM method gets expensive quickly. Discrete graphics isn’t power efficient, but it is powerful. And some professionals simply need more than 256GB RAM, regardless of what myth some people may believe with regards to memory on Apple Silicon.
LPDDR5X will bring 64GB chips, so a theoretical quad SoC ASi Mac Pro could have up to 1TB of RAM, with 2TB/s UMA bandwidth...?
Would that be the reason why we didn't see any high end minis? Maybe they will replace those with they mid-tier Mac Pro, with all the M1 Max dies.
So replace a machine that costs about US$3k loaded (not counting excessive SSD pricing) with one that starts at US$6k with much worse specs...?
Maybe they can finally create that mythical xMac and have it be the very final Intel Mac Pro! I can imagine... x for Max, then Mac for, well, Macintosh.
iMac (24")
iMac Pro (27")
xMac (max, buildable)
The final Intel Mac Pro will be new internals, but the 2019 Mac Pro Cheesegrater 2.0 will remain the chassis of choice...
"No xMac for you...!" (Seinfield / Soup Nazi)
I see this rumor being true for a few reasons.
1. The "new" Mac Pro design will coincide with its transition to Apple Silicon. It's the only conceivable approach - why do a re-design for the Intel chips but not your new "flagship" machine? Additionally, it's clear the M1-series of chips require significantly less active cooling than the current generation Intel Xeon chips. A redesign for a new cooling mechanism makes the most sense in this regard.
2. The Intel Mac Pro update will be a silent/low-key refresh: new generation processors, some minor spec adjustments, and that's it. Would make sense to have a last alternative for customers wanting an Intel device (for software/hardware compatibility, etc.)
I could see a press release for new internals on the 2019 Mac Pro, issued before WWDC 2022, then the new smaller (half the volume) ASi Mac Pro is debuted / showcased at WWDC 2022, shipping by the end of the year...