Canon Japan released a new teaser for a 8K EOS Cinema camera, which is expected to be announced in 2021 along with another 8K Cinema EOS camera.

Canon is currently working on two new 8K Cinema EOS cameras. One will be a flagship camera with “A camera” aspirations, just like the the Canon Cinema EOS C700, while the other is a modular camera with the similar positioning to the Cinema EOS C300 Mark III and Cinema EOS C500 Mark II.
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https://www.dailycameranews.com/2020/12/new-canon-eos-8k-cinema-camera-teaser/