Here's what I think will happen:
We'll get the iMac Pro with M1 Pro/Max, possibly even a Jade-2C Die (although at that point I'd have a hard time seeing a clear distinction from the Mac EvenMorePro for 95% of users) at WWDC. I guess same goes for the Mac Mini - minus Jade-2C Die there, not because it couldn't handle it, but for segmentation purposes. I'm not entirely sure the Mac Pro will get an update as I can fathom them selling it like "yeah, now you have these tiny machines that are even more Pro than the Mac Pro so stop complaining". And they are not totally wrong for said 95% of users (the remaining 5% probably are fine for 2 more years since they "just" invested 20K+$ into a computer). So I guess.... either iMac Pro with Jade-2C and no Mac Pro, or no iMac with Jade-2C and that exclusively for the Mac Pro. I'd bet the former. Jade-4C ... I don't think that exists outside of a lab, at least for this generation.
Then we'll get a lot of iPhones with even more/wider cameras, some killer influencer gadget no sane person needs, and a new A16 processor fabbed on TSMC N3 in September that again nobody will actually need considering the competition hasn't even caught up to the A14. Won't be much faster, but will use notably less energy, again. Battery life sells, they have finally taken that hint.
Then, October/November we'll celebrate the finished 2 year transition with the first entry of the next generation Apple Silicon devices: The new MBA with whatever they call that chip, I'll guess M2, since, again, them being out of step is intentional. It'll be based on the A16, just more cores, bigger caches, higher clocks, basically the A16X plus x86 emulation junk, just like M1 was to the A14. Maybemaybe even a new Mac Mini in the new design we've seen at WWDC, but I can also see a future where the Mac Mini slides back into the "Pro" segment, relegating "Plebs" to using either a MacBook or an iMac 24". It would make sense from the perspective that the overwhelming majority of M1 users bought the MBA, not the Mac Mini, but it also would cause some well earned outrage from people that just want a decently fast, quiet and affordable Mac and a screen of their choosing, but don't require insane cpu/gpu core counts - like me.
I'm afraid the MacBook NotSoProButSortaAir is dead. Apple had a hard time justifying that thing over the MBA last time around, and between the MBA, MacBook KindaPro (6+2/14) and the... eh... iPadBookPro there really aren't any niches left to fill, especially if the MBA gets Mini LED as well. They will keep selling that thing until they run out of left over 2017 MBP chassis and touchbar strips, but then silently fade it out.
Overall I think people will be disappointed with the speed gains comparing M2 to M1 since Apple played it's biggest card already switching from x86 to a much wider, much faster (in terms of ST perf) ARM design, loaded with a lot of fixed function accelerators the intel machines simply didn't have. Still, we should see about 20% gen over gen, with most of it coming from higher clocks the new process allows at the same power draw, and some of it coming from incremental improvements.
Or maybe none of that. ?