Kopite7kimi, a well-respected Nvidia leaker, has revealed key information about Nvidia's high-end gaming and datacentre GPUs, the GB202 and GB100. Both will get an increased SM count and L2 cache, among other upgrades. https://www.notebookcheck.net/Nvidia-Blackwell-GB100-and-GB202-GPU-specs-revealed-by-tipster.756499.0.html
There are 2 SM's in a TPC, and TPC's go inside a GPC.
A 10 SM GPC would have 5 TPC's, a 12 SM GPC would have 6 TPC's.