Recently the new firmware 1.1 for the EOS R5 was released, with which among other things the implemented 
heat limits have been slightly reduced. As an outlook, another firmware update for the R5 was announced. This should contain a Canon Log3 option as well as an "option with lower bitrate for 8K RAW video recording", also an option for lower bitrate for all IPB video recording modes.
Now, we would like to inform you that a firmware update has been announced for the Canon EOS 1D-X Mark III, which will include Canon Log 3 and corresponding lower bitrate recording modes (for 5.5K RAW video recording and for all IPB video recording modes). The updates will be available for free on the Canon support website in the near future.
Canon EOS 1D-X Mark III
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