Sony has it with the FX3 and Panasonic with the S1H. Only Canon does not currently offer a full-frame DSLM with active cooling that would allow longer recording times for video operation. Now rumours are growing on the net that Canon could launch a "Cinema" R5 with the suffix "C" - i.e. a Canon EOS R5 C later this year.
Among others, Canon Log3 updates for the current 
Canon EOS 1DX Mark III and EOS R5 have already been announced by Canon via firmware update. According to rumours, a Cinema EOS R5 C will also include Canon Log2 in addition to longer, continuous shooting times.
In our eyes, a Canon EOS R5 C would make perfect sense, because we can think of a whole range of moving image scenarios / use cases for which a corresponding R5 C would be ideal: from the hybrid "content producer" for photo and video to classic B-cam setups to low-profile reportage and doc formats. Especially as a handheld camera, the R5 makes a lot of sense to us due to its very good stabilisation performance - a stabilisation performance that is currently not found in Canon's Cinema EOS segment.
Even though we, like many others, would very much welcome an integrated Vario ND filter in a future EOS R5 C. We think such speculation is realistic: We consider such speculations less realistic. More likely (and in view of the aforementioned competition from Sony and Panasonic probably more decisive for Canon) is an XLR
adapter solution via hot shoe. Or to put it another way: if no XLR solution is planned for the Canon EOS R5C, an internal ND filter solution would again become more likely.
In our opinion, a false colour function would also be a good fit for an EOS R5 C, which is already quite popular in the entry-level Cinema EOS segment with the C70 - and would therefore not be unrealistic.
We could also imagine a dual card slot recording function for formats below RAW such as ALL-I and IPB, and an external timecode option via flash sync recording (similar to the S1H) is not completely out of the question.
In terms of price, a Canon EOS R5 C should be well above the current R5 - presumably also to protect the Cinema EOS segment. We would guess at least 6,500 euros.
So much for our speculative dish on the Canon EOS R5 C - what would be important to you in a Canon EOS R5 C?
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Kinefinity MAVO Edge 8K - Erster Demo Film