The latest macOS 11 beta build includes spec information regarding compute unit count, core clock maximum boost and maximum TGP for AMD's upcoming Navi 2x GPUs that may end up as part of the Radeon RX 6000 series. There also are mentions of the Navi 31 GPU based on the RDNA3 architecture.
https://www.notebookcheck.net/More-leaks-AMD-Navi-2x-and-Navi-31-GPU-spec-details-found-in-latest-macOS-11-beta-code.495804.0.html