I swear it, each year it's the same of course. Regardlessly, website Mydrivers.com shares some  new information about AMD's Ryzen 4000 CPUs as well as the X670 motherboards. 

At the end of 2020, AMD Ryzen 4000 processors will be released together with the matching X670 motherboards. The processors are based on the Zen 3 architecture and are said to be the last for the AM4 socket. The X670 chipset is likely not designed by AMD, but another manufacturer like ASMEdia or VIA. X670 is said to provide better support for PCIe 4.0 and increase the connectivity for M.2, SATA and USB 3.2 drives. 

AMD should be able to fit a few more transistors in the Ryzen 4000 CPUs by using Extreme Ultraviolet Lithography in the 7nm+ fabrication process. Another performance increase should be achieved by increasing the power per clock cycle and higher clock rates. The fourth generation of AMD Ryzen processors is said to be the last one compatible with the AM4 socket. New standards such as PCI 5.0 and DDR5 are likely to make backward compatibility more difficult. A move to the next memory generation DDR5 and PCI Express 5.0 is getting closer likely late 2021 or early 2022.

Ryzen 4000 and X670 scheduled for late 2020