What I've been reading is that Apple may not even need a Mac Pro anymore, and they may be re-thinking offering one. Since Apple Silicon motherboards don't have slots for additional RAM, and their SSD's can't be upgraded, there seems to be little point in the Mac Pro form factor.
I've been trolling the internet/Youtube almost daily for any info regarding if Apple was going to come out with a newer Mac Studio model. Lots of references to an upcoming Apple Silicon Mac Pro...but then these Apple Silicon Mac Pro rumors have been flying around for at least 1.5-2.0 years (new Mac Pro just around the corner).
But you did link an article on that topic...thus someone has at least been considering it.
My theory is...when Apple finally releases an Apple Silicon Mac Pro...they're going to absolutely blow the doors off anything currently available (make the Mac Studio seem slow).
It's probably going to have at least four M2 Ultra chips linked together in some special way...and probably have upgrade options for even more.
The current top end Mac Studio has a single M1 Ultra chip with 20 CPU cores and 48 GPU cores. To "blow the doors off" anything currently available...this theoretical new M2 or M3 based Apple Silicon Mac Pro...will probably have a total of 80-100 CPU cores...and 150-200 GPU cores (unless Apple is able to substantially improve the performance of each core CPU or GPU...compared to current per core performance levels).
Starting price will probably be around $5000-$6000 (similar starting price to the current 2019 Mac Pro)...and with upgrades (whatever they may be...RAM, SSD, CPU cores, GPU cores, etc.)...sky is the limit.
Current 2019 Mac Pro (maxed out)...is almost $52,000. Apple not afraid of big price tags!!! Lol
Regarding an Apple silicon Mac Pro and non-upgradeability after purchase (RAM, SSD, etc.). We've been down this road before with just about every other Apple computer model (especially Apple portable/laptop computers).
Of course no one really likes non-upgradability. Maybe the day has finally come for a non-upgradable Mac Pro. Need to configure it with as much RAM, SSD, CPU cores, and GPU cores as it will ever need in its lifetime...at time of purchase.
Hopefully we hear more about an upcoming Mac Pro at WWDC 2023 in about 1 months time.
Nick