The Cinema EOS line feels like it has been ignored for quite some time. While there were new products in the pipeline, we have been told multiple times that global events scuttled at least a few of them. We previously reported that Canon would announce follow-ups to both the Cinema EOS C300 Mark III and
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I fully expect RF mount upgrades to be announced.
I also hope Canon allows/announces/encourages more third-party Cinema Lens players to participate in the RF game.
I presently work with Atlas Anamorphic and Duclos Cine-Modded Zeiss Otus ZE (de-clicked aperture) lenses. They are all EF-mount, native on my C300 and C200. Then I acquired an R5C for its lighter/smaller form and duality with photography. I use an EF-RF adaptor - and when it works, it is nice - but recently, one of those adaptors' release mechanisms broke and got perma-stuck to an Atlas. Fixed with a mount swap. But yeah, a C300 IV with RF might be nice, but not until I can potentially RF-convert my lens investment (assuming the option is possible and available by those vendors).
Argh... now Nikon buys Red and complicates.
All this is to reflect on the decisions we, as a community, have had to make to pursue these mount changes. The lenses are the paintbrushes we use in our art.