Well, thats given its "up to" and i wont certainly be looking at the 56-core model, cause that would surely beyond my budget, but if Intel had sense and wanted to compete with Threadrippers, i could see myself having a look at potential 2-tile version of this with 28cores - that i would consider acceptable upgrade over what i currently have. If it was in the 32core TR price-range, or even better 24-core, or somewhere in between, and performed similarly, which i expect to happen, i would give it a thought. And if full 56-core version is supposed to have 64GB of that HBM, i think its safe to assume 28core part might have 32GB of it. Which is indeed still awesome for a home workstation. I wonder if its possible for it to cost those 1500~2000 EUROs like Threadrippers cost.
BTW, once again, regardless of what precisely the HBM is, out of those options, would it not provide the most significant performance improvement, i mean more so than the new core architecture or whatever AVX stuff? HBM is way faster than DDR5, right? And it will sit literally next to the cores, so the latency will be way lower, as you said.