https://wccftech.com/amd-zen-3-launching-2020-zen-4-zen-5-in-development/

AMD has officially revealed that the company is currently developing the Zen 5 CPU core microarchitecture to succeed Zen 4 after 2022. Both the Zen 5 and Zen 4 core designs are being developed by two separate leapfrogging design teams, CTO Mark Papermaster confirmed.

This is the first official acknowledgement of 'Zen 5' as a distinct core architecture and would officially make the Zen architecture, fathered by legendary CPU architect Jim Keller, one of the longest living x86 CPU architectures by AMD.