Gigabyte's X570 AORUS MASTER motherboard is on the test bench at Vortez today. Here's a quote from the review to get you started:
The X570 AORUS MASTER is certainly up to the task at hand, starting with a trio of heatsink-equipped PCI-E 4.0 M.2 slots, as well as the same count of PCI-E 16x expansion slots, all featuring an ultra-durable PCI-E Armour.