This has been on the record for some time now, and Nikon has now announced their development of the Z9.
A decent source has sent out and told me that a special RF mount camera is about to be released in the second half of 2021, but it isn’t the R1. until supply chain issues are resolved, Canon intends to release the book as soon as possible.
Could this be a higher-resolution model of the EOS R5?
In terms of the release date, R1 appears to be looking good, but it will not be released until the first half of 2022 at this point.