Canon News has uncovered a patent that appears to show RF mount cinema zoom lenses. It looks like these are cinema lenses because of their complexity and larger image height of 14mm. APS-C lenses from Canon tend to have an image height of 13.66mm.
Japan Patent Application 2020-194056
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Image height is given as 14mm, so it wouldn't cover FF sensors. Probably for Canon's Cinema cameras, which have sensors with a diagonal of 28.2mm
https://www.bhphotovideo.com/c/prod..._name:canon,fct_zooms-primes_4696:zoom-lenses
What is more you can use them even on EOS 1D X series Camera and by providing external 12V supply you can use power zoom too.
Just for fun, I did this one day... ;)