According to latest rumors by CR, the upcoming Canon EOS R1 now expected to be announced in the second half of 2023. There could be a teaser in Spring 2023. Base on latest rumors, Canon EOS R1 will be a new resolution king, and it will focus on 8K video production.
Since Sony, Leica have released their 60MP cameras, if Canon EOS R1 want to be the new resolution king, the sensor should be over 60MP. The source also said that the form factor and ergonomics of EOS R1 will take a step forward than previous flagship cameras and EOS R3. Stay tuned for more info.