The X570 chipset is compatible with AMD's upcoming Ryzen 3000 series. So far, we have been led to believe that it will support PCIe 4.0 and will, obviously, next-gen performance and speed. A new leak appears to confirm its all-4.0 nature, as well as the number of USB ports an X570 motherboard may have.
https://www.notebookcheck.net/More-details-on-X570-motherboards-allegedly-leaked.419737.0.html