The M2 will be using the same 4nm and uArch, GPU, NPU design from A16. ( I am hoping it would break the 2000 GB5 barrier ) And Apple will slowly rollout M2 on Mac over the course of next 18 months. Starting with Mac Pro first. The whole Mac Lineup are currently in huge demand, and if I remember correctly Tim Cook himself mentioned the Mac is breaking shipment record. One could extrapolate using sales data and I expect this to be something like 25M unit rather than the usual 18-20M unit. Apple wants to capture these market as soon as possible. Considering they could have lost a lot of Mac users over the last 3 - 4 years. ( They haven't updated the Active Mac user since 2018, some numbers just dont add up ).
Making sure they have enough capacity to feed whatever Mac sales they have. As some have reported they are still waiting for their October / November MacBook Pro Order.