I've mentioned it over at the other place, but I think there's a good chance that M2 family chips will be built with A16 generation CPU and GPU cores. Since A10X, Apple has maintained a pattern with alternating years: odd-numbered generations of A-series chips were iPhone / low end iPad only, while even generations also had a second tapeout of the bigger 'X'/'Z' chip for high end iPad. M1 was really A14X, so if this pattern continues A16X is M2.
Obviously that might have been a temporary thing, but it makes some kind of sense to me that they might want to keep doing it. Reduces how many tapeouts they have to do, and each Mac can live with a major refresh every 2 years.