References to upcoming Navi 20-series GPUs, the Navi 21 Lite, Navi 22, and Navi 23, have surfaced in new Linux driver patches confirming that AMD's RDNA 2 development is on track. Not much information can be gleaned from the driver code itself apart from speculation that Navi 21 could shape-up to be a viable competitor to NVIDIA's upcoming Ampere offerings.
https://www.notebookcheck.net/AMD-Navi-21-Lite-Navi-22-and-Navi-23-spotted-in-Linux-driver-patch-expected-to-offer-tough-competition-to-NVIDIA-Ampere.441224.0.html