https://wccftech.com/amd-zen-3-4000-series-processors-and-600-series-chipset-landing-in-late-2020-getting-usb-4-0/

It is a brand new year and its time for some brand new leaks. This one comes from Electronic Times and they claim that AMD's 600-series chipsets will be landing near the end of 2020. The 600-series chipsets will not only support USB 3.2 but 4.0 as well. The new chipset is designed for Zen 3 based processors and should usher in a new era for AMD processors bringing IPC gains that will put even Zen 2 to shame. We have already heard about this particular timeline and considering this is the second leak reiterating that it is starting to look like reality.

Of course, if this report is to be believed then we are looking at the Zen 3-based Ryzeen 4000 series processors launching at CES 2021 (considering it doesn't make much sense to launch the processors without the underlying 600-series chipset becoming available). Backward compatibility and support is something on which we have very little information at this point so its best to keep an open mind.