I think M3 gets announced, along with its high-end variants. It HAS to be. The name "Scary Fast" would be a strange choice if they don't actually have anything to announce that is scary fast relative to current products.
I suppose there's the possibility of some new, even higher-end variant of the M2 chip for their Mac Pros, particularly with the disappointments around how they compare to the now-discontinued Intel ones. Maybe this chip would further expand the tight RAM limit the new Mac Pro suffers from. Given what a niche product the Mac Pro is though, I don't feel like this would deserve a big announcement all by itself and I can't see a chip like that being available for their other Macs.
I think yearly is the only long-term possibility.
I know people basically settled on the 18-month idea at the beginning, but that always seemed incredibly strange to me, both because there was zero evidence for it and because of how insanely weird and impractical a schedule it would be for them to maintain with how the tech is researched and made. I mean, their A-series chips, which are based on the same tech, are already released annually. How exactly would that even work, to not sync the M-series chip releases to that in any way? I think this only sounded so natural to people because of the haphazard way they've had to release Macs in the past with how they were tied to Intel's fall-on-face unpredictable chip releases. It doesn't make sense anymore in the new world of Apple Silicon. Supply issues still leave them with some unpredictability for now but that will resolve over time as they mature and diversify their supply sources and as the COVID-19 crisis moves further and further away in the rearview mirror.
So that just leaves a 1-year or 2-year release cycle. 2 years would be the most sensible given how mature this tech is and how unnecessary frequent speed increases are to most of the target audience. It would also mean they could support their Macs for twice as long with the same effort, and a long support life is particularly important to Mac users. But it would sit poorly with their shareholders because of the reduced hype and profits. So I think we are going to be seeing 1 year. Certainly that's what the evidence has been pointing to very, very strongly for a while now.
This I think is a really clever point and probably the only thing that gives me any real pause about everything I said above. Maybe though they just quietly update it to the M3. Or they leave it on the M2 because there's an understanding that this is a niche, 1.0 release that they have no expectation of widespread adoption for yet. I would also imagine, given the heat, weight, and sizing nightmare they've had with this thing that it's non-trivial to equip it with the latest and greatest chip generation going forward and maybe they are resigned long-term to that reality.
I'll end this by pointing out that they don't have to release products to announce them. They could announce new MacBook Pros for example but not actually release them until next summer. They could even just use this event to showcase the performance of the M3 chips that future devices will come with, sort of like what they did when they announced Apple Silicon in the first place.
Thanks for all the writing. You clarified a few things and made me wonder even more about the possibilities.