Gotcha. I honestly didn’t think there had been any real upgrades to what Apple’s using, until just recently with the Xeon-W and Skylake-SP releases.
Do you think the upcoming Mac Pro will just offer the W series with its max 18 cores, or will they go with the 61xx/81xx? There are some nice parts there... 6144, 6146, 6154, 8168, 8180. 6-channel memory is a big deal for those whose workloads are bottlenecked by memory bandwidth. I suppose dual processors would be too much to ask for. I guess it all depends on how pro is Pro.
My guess is W series; after all Apple’s never offered more than 12 cores before now, and the market for 20-56 core workstations must be very small. But then again, they have offered dual socket machines in the past, though definitely not at the $15k-75k level.