AMD has released a video featuring Robert Hallock their director of technical marketing and John Taylor their chief marketing officer to celebrate 5 years of Ryzen with new info. Plenty of it is a chilled-out chat about first introducing Ryzen but we do also get a glimpse of what's to come in the near future.
What we can expect is a refresh, with them talking about how others are going for a mixed-core approach (hi Intel) but AMD are doing it differently right now. Rather than go with designs that might be harder to implement in software, they're sticking to their "Zen philosophy" focusing on their existing cores. Hallock goes on to mention how they're at the end of socket AM4's life, so in 2022 there will be a new platform with support for DDR5, PCI-e Gen 5 but with coolers from the AM4 socket still supported.
However, new Zen 3 CPUs are coming out in early 2022 for the AM4 socket which will include processors using their 3D chiplet technology named 3D V-Cache which Hallock mentioned "an average 15% performance bump for games". Zen 4 will also be later in 2022, with it using the new socket platform.
See the video below: