As for the various M2 models (and their codenames), current reporting/speculation seems to be around:
- M2 (Staten): 8 CPU cores and 9/10 graphics cores
- M2 Pro (Rhodes Chop): 10/12 CPU cores
- M2 Max (Rhodes 1C): 12 CPU cores
- M2 Ultra (Rhodes 2C): 24 CPU cores
- M2 Extreme (Rhodes 4C): 48 CPU cores
GPU cores are harder to know. Mark Gurman believes the M2 Pro and Max will have the same 16/32/64 GPU cores as the M1 Pro/Max/Ultra, but if M2 has 10 cores, it stands to reason the more powerful ones will also be in sets of 10.