The Canon Cinema EOS C500 Mark II will be announced on or around September 5, 2019, ahead of IBC in Amsterdam.
Below are the specifications that we've been told but have been unable to confirm. The image, however, is exactly what the Cinema EOS C500 Mark II will come as.

Canon Cinema EOS C500 Mark II rumored specifications: (New information in bold)
- Full-frame sensor
- Records up to 5.9k at 60p RAW full frame
- Records 4K60p in Super35 crop internally in Cinema RAW light
- Records 2k120p in Super16 crop in Cinema RAW light
- Can record in XF-AVC in 4k and 2k oversampled from the 5.9k sensor with 4:2:2 10- bit sampling
- CFExpress is needed because of the bitrate, the 5.9K RAW is 2.5Gbps, 4k is the same bitrate as the Cinema EOS C200 at 1Gbps
- User interchangeable lens mount
- Optional modules with EVF, genlock, timecode, 12G-SDI, etc
- EF and PL mount available at launch
- Power supply with BP-A series batteries, an optional module for V-Mount batteries
- Optional module for 4x XLR inputs
- Backwards compatibility with EVF-V70, LV-M1 and some other peripherals from previous Cinema EOS cameras
- New media usage: CFExpress cards for faster readings and writing speed
- WiFi and IP Streaming capabilities
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Absolutely :p
All the more so as the EF mount is dead. Oh, wait...
The absence of R mount does make me wonder. Maybe there's a mechanical design issue.
Maybe it's just that they felt they needed to have PL mount without an adapter and EF mount was the easy alternative. Or maybe they made it modular and an RF mount is coming later. Lots of customers with expensive EF and PL lenses, not so many with RF lenses.
It's not a design issue, it's still early in the R mount evolution. There are hundreds of thousands ef lenses out there. It makes sense to keep using the format that works and then introduce the R mount as a option later along side the ef mount.
Non enough RF lenses yet, and no Cinema RF lenses yet as well. Not sure if cinematographers would have liked an adapter, and how it could impact rigging needs. Not sure also if RF fully motor-driven focus would play well with the needs of focus pulling - but I never had a chance to use an RF lens yet.