So 14" and 16" will come with M1X (an M1 with more cores) and close to the A15 (thus M2) release. Unless they decide to leave the M2 for early 2022. This first gen "high end" MBPs is comming 6 months later than it should.
Basically the way to look at this is exactly the same as how the iPads have be done in the past…
The iPad Air always got the A?? chips whereas the iPad Pro always got the
A??X chip.
Now the A??X chips have now been rebranded so to speak as M? chips, which will go into the entry level products such as:
MacBook Air
MacBook Pro (entry level)
iMac (entry level)
Mac Mini (entry level)
All of which have already been transitioned over to the M1 Which are rebranded A14X chips.
Now presuming apple keep up with how they have done stuff in the past… the pro level Macs should get the M1X chips (which are basically an even better version of the M1 chips or A14X).
So currently we are on the M1 series… so now the M1X is believed to go into:
MacBook Pro (High End)
iMac (High End)
Mac Mini (High End)
Now that just leaves the Mac Pro, now presumably judging by the 2020 iPad Pro this could potentially end up getting the M1Z chip which is a step up again from the M1X.
Now once the M2 is released (M2 will be basically be an A15X), this will then start the ball rolling again with the entry level Macs getting it, with the high end macs getting M2X and the Mac Pro getting the M2Z… this does all depend on IF apple go with their usual naming scheme for chips, but they might not do it this way at all… but to me this makes the most sense…
Once the M2 roll out is complete, it all depends on apple what they will base the M3 on… it could be the A16X or the A17X… it just all depends… but I have a theory…
We may see a transition of the iPhones and iPad Airs etc over to M?C chips… there has been rumours of it floating around… like how the iPhone 5 and 5C were named…
So the next iPhone and iPad Air might get the M2C series chip (which is basically an A15) then iPad Pro and entry level macs getting M2, the higher end macs getting M2X/M2Z chips… but who knows