Canon has updated its R5 to a proper Cineline camera.
The limitation due to overheating is solved by a built-in cooling system.
The Canon R5C has all the photo features of the R5 but an upgraded Set of features for video, like timecode and a superb autofocus system with eye-tracking.

Our Set comes complete with a cage, memory cards, and the Tascam Audio interface, which works seamlessly with the R5C over the new multi-connector hot shoe.

EOS R5 C - Key Features

    Full-frame sensor with 8K/30p 12-bit RAW recording or 8K/60p when using an external power source
    45-megapixel images at up to 20 fps
    Precise eye AF via Dual Pixel CMOS AF and intelligent face/head tracking via EOS iTR AF X
    Extensive professional shooting formats, including three new variations of Cinema RAW Light
    Active cooling for long-time shooting
    Timecode terminal
    RF bayonet with advanced Combination IS
    Expanded connectivity and multi-function accessory shoe