I hope that is the case. It’s Apple though, so nothing is stopping them from reusing the M1, even on a new Mac. Just look at A12Z vs. A12X on the iPad Pros.Apple clearly said that the MacPro will have the final chip in the M1 Family.
All of the M1 processors the regular, the pro, the max, and the ultra, all share the same firestorm/icestorm cores.
This new chip Will be based on the next generation avalanche/blizzard cores.
So… M2
Not M1X or M1+
We already have all of the mobile M1 chips, there’s no more.
After the Mac Pro is introduced most likely at WWDC, we start all over again with the low end M2, followed by the M2pro and max, then the M2ultra, all based off of the avalanche/blizzard cores.
For all we know, Apple will skip the cores from the A15 chip in macs and go straight to A16 cores. They’ve skipped in the past when it came to the X variants in iPads (A11, A13).