Canon Japan has released a teaser for an 8K Cinema EOS camera, one of two 8K Cinema EOS cameras I expect will be announced in 2021. We'll likely get an “A-camera” 8K camera above the Cinema EOS C700 FF and an 8K camera with a modular design like the Cinema EOS C300 Mark III and Cinema EOS C500 Mark II.
It turns out a marketing presentation was made at Inter BEE 2020 ONLINE a few days showcasing what Canon has planned for 8K.

As a leading company in imaging technology, Canon is working to develop 8K solutions in anticipation of further advances in image expression. A compact, lightweight 8K camera that can be used in a variety of shooting styles. EF Cinema Lenses boasts an extensive lineup of wide-angle and telephoto lenses. 8K display with high brightness, high contrast, and high color gamut. The blending of four real 4K projectors enables a large screen projection of real 8K images. From input to output, the Canon 8K solution provides an unparalleled viewing experience
Canon did show off a modular 8K Cinema EOS camera, as well as an 8K conversion box. For the moment it's not fully understood what the conversion box is for. The best guess from YMCinema is that the box is for 8K output, as the camera will record 8K internally.
I suspect we'll hear something from Canon USA in the next little while.
The question -- EF or RF?
Anyway, this looks promising :_)
8k is really for cinematic stuff at this point, stuff like movies in the theater and high end streaming to people with 8k TVs. It also helps with flexibility in editing, but again that's for the cinematic type of productions who have no issue with money for storage capacity and processing power.
You guys know if you feed YT a file that is 2.7K resolution or higher it plays back at VP9 streaming (instead of AVC1) and will look better in even 1080p quality because the stream is a higher quality stream. I shoot everything in 1080p usually and upscale to 4K and feed that to YT. The playback is noticeably better...unless you're using Safari as Safari doesn't support VP9 streaming. At least the last time I checked it doesn't support it.
That's why I was a bit miffed. Man how do you make a video about an 8K camera and then feed YT a 1080p file? The playback in my option is a bit sub-par.
Any who, enough of my bitter ramblings...