Codenamed "Valhalla," the X570 chipset brings PCIe 4.0 to consumer desktop computers. The motherboards to use it will support the upcoming EPYC and Ryzen processors. Although not official yet, images of two MSI boards that use the X570 chipset have just been spotted as well, so the launch of the platform is imminent.
https://www.notebookcheck.net/Unofficial-AMD-X570-platform-diagram-surfaces-online-as-well-as-images-of-MSI-X570-based-mainboards.421247.0.html