According to latest Canon rumors, the next Canon RF mount full frame mirrorless camera will be the replacement of Canon EOS R. This camera will not be named Canon EOS R Mark II. It will sit between Canon EOS R6 and Canon EOS RP.
Currently, there is no specs rumors about this camera, the announcement for this camera is expected in late 2022 to early 2023, and the release date is expected in Q1 of 2023.
via: CR