Likely mostly MSI, since reports have said that X570 boards would only cost about $40 more than X470. It doesn't look to be that special. Ok so it's eATX and has 4 PCIe x16 (x4 electrical) Gen 4 slots and 3 M.2 slots, but still, outrageous...
https://www.msi.com/Motherboard/MEG-X570-GODLIKE.html