A report by Digitimes indicates that AMD might delay the launch of its Zen 3-based Ryzen 4000 desktop CPUs to 2021. The report cites the "mediocre performance of Intel's Comet Lake" as a key reason for the delay.
https://www.notebookcheck.net/No-Ryzen-4000-this-year-Report-claims-that-AMD-s-7nm-Zen-3-Vermeer-might-be-delayed-to-2021-due-to-lack-of-competition-from-Intel-Comet-Lake-S-for-Ryzen-3000.476571.0.html