Apple might have a Mac Pro in the pipeline due to arrive in 2022 which will carry a 64-core ARM-based chip, and will be backed up by 48-core and 32-core models, according to the latest from the grapevine.
This rumor – and it is just that, a bunch of speculation delivered via Twitter – comes from @LeaksApplePro.
So, as mentioned, there will be three different models in theory, all powered by Apple’s custom processors (apparent successor models to the M1) instead of Intel, as they’re marked as offering a mix of performance and efficiency cores (like the M1).