Conjecture on my part, but I wouldn't be surprised if we also see a 64 core Threadripper - there's going to be a 64 core Epyc:
https://wccftech.com/amd-7nm-epyc-64-core-32-core-cpus-specs...
Although they may save it for a "Zen2+" or something similar, like they did with 32 core Threadripper