Update: New information in bold.
I have been told that the next Cinema camera Canon announces is likely called the “Cinema EOS C300 Mark III”.
Canon Cinema EOS C300 Mark III information:
Most likely will be called C300 Mk III (almost 100% confirmed)
It has the same body as the C500 Mk II and uses the same accessories
Just as the C500 Mk II, it has the same optical axis as the C200 and C700 cameras, so the bridge plates, shoulder mounts, and rod supports are the same
It sports a 4K super 35 sensor with the capability of recording 4K120 without crop in Cinema RAW Light format
It also has a “dual ISO” function when recording in XF-AVC
It has an anamorphic de-squeeze function and false-color built in for monitoring (with the C300 Mk II you had to use an external monitor with these functions)
New Super35 sensor, developed from scratch
4K up to 120p with Dual Pixel AF, 2K up to 150p
Canon will also reportedly announced a new Cinema lens alongside the new camera body.