A reliable source just whispered (thank you!) that Canon is coming out with a new camera. The source said that the camera will be 75MP. This has been long rumored since the RF mount came out.
It's no surprise that Canon is coming out with a high-megapixel camera. Canon is pretty proud of the megapixel crown from the start of the digital era – they were not going to let Sony have that crown for long.
No other details are known, but if I had to guess I would suspect it would be based upon the R5.
We expect more information soon.