As previously rumored back in April, and mentioned again here, Cinema line or video specific camera with RF mount would be pretty cool. We just saw the Sony a7s3 drop at $4000. And I keep seeing a lot of unfair comparisons to the R5 and R6 which are truly HYBRID cameras unlike the a7s3 which Sony obviously designs expressly with video in mind for a small MILC body. I've never seen anyone say they are buying an a7s to shoot stills, and if they are even using to do any stills, it's few and far between. So Sony can build a video MILC to do all the frame rates without much if any overheating issues internally, because unlike both the R5 and R6, the a7s is NOT over sampling anything. Think about the EOS R or the older 1DX2. The camera crop into 1:1 pixel readouts at 8.8MP for 4K. The a7s has a sensor built to do this natively, which is perfect for video, but lacking hugely by comparison for stills.
I have wanted to see Canon do this for years. But if we get an RF mounted Cinema C100-200 body with IBIS, that would be awesome too! But an R5 type body with a 12MP sensor and Digic X... well there would be most likely no overheating issues even at 4K120. But I'm probably hoping for too much lol