According to YouTuber Moore’s Law is Dead, AMD is working on three Ryzen Threadripper lineups codenamed “Chagall”: The non-Pro stack with 64 cores, quad-channel memory, 64 PCIe 4.0 lanes, and a speculated launch in August or September. The Pro lineup with 8-channel memory and 128-PCIe 4.0 lanes, and launch in early 2022. Finally, the 3D stacked variant of Chagall is expected to launch sometime in 2022. It’ll work with existing TRX40 and TRX80 boards, and will be based on Milan-X.
Trento, the custom version of Milan (as of now) has no planned Threadripper variants and will be limited to pre-planned University and Government Super Computer. Finally, Zen 4 will launch in late 2023 with the Epyc Genoa lineup featuring a maximum of 96 cores. Consequently, the Threadripper lineup based on the same design will also feature up to 96 cores, and launch sometime in the first half of 2023. Keep in mind that this is the tentative roadmap, and things may change a bit depending on the supply situation and rival offerings from Intel: