Canon released new firmware updates to the EOS-1D X Mark III and EOS R5 cameras in August, 2020. Further firmware enhancement to support advanced video recording capabilities for both cameras was announced by Canon as well.
Since the EOS R5 basically replaced the venerable EOS-5Ds and EOS-5Ds R cameras, it is not surprising Canon will be introducing a mega-pixel version of the EOS R5 (EOS R5s). Prototype version of the camera is already out in the field for testing, rumored to have a 90MP sensor.
Frankly, I find this mega-pixel sensor race to be silly but it is a marketing game and hype is essential to grab attention.