As part of AMD's Financial Analyst Day 2022, AMD unveiled an updated server CPU roadmap up to and including 2024. Nestled within AMD's latest server roadmap, it highlighted the Siena series, much like the Genoa (due Q4 2022), Bergamo (Due 1H 2023), and the Siena family from its 4th gen EPYC series are expected to land sometime in 2023. While roadmaps only give a glimpse of what is expected, they are used internally to plot and plan specific product groups and keep them on track for release.
https://www.anandtech.com/show/17440...64-zen-4-cores
AMD Unveils Siena, A Lower Cost EPYC Family With Up to 64 Zen 4 Cores
10th June 2022, 08:43
AMD Unveils Siena, A Lower Cost EPYC Family With Up to 64 Zen 4 Cores 
