So, the entire stack is all using just the same LGA 4677 socket, right? Because it seems like a waste for the monolithic versions with <= 24 cores to have a full 8 memory channels when they only use 4. Also, with only 64 PCIe lanes connected, the other 48 lanes' worth are just dead pins & motherboard traces.
I'd consider a 16-core or 24-core version, but not if the motherboard alone is going to cost me like > $1k, mostly for PCIe lanes and memory channels I can't use.
Socket is the thing no leaks have addressed one way or the other AFAIK. While the monolithic CPUs will be quite a bit less to manufacture the motherboard situation is the big question. Even if boards are made for 4ch and fewer lanes they're still going to be quite expensive if they're using that LGA 4677 socket (I'd assume these would start around $400-500).
Too bad. I was hoping they'd follow-on what they did in the Cascade Lake generation, with its LGA 2066 for mid-level users and LGA 3647 for the high-end. That's going to price me out of the Xeon W market.