According to a suggestion that surfaced on Weibo (and NOT on the usual rumor site…
A First Look at Canon’s 8K Camera Prototype at Photokina
Canon is displaying an 8K camera prototype at Photokina, and the folks at Cinema5D took the chance for a first look and some questions.
The camera in the video actually is a modified C300 Mark II with a prototype 8K super-35mm sensor developed by Canon. The prototype shots 8K RAW files at 60fps. One hour of footage means more than 10TB (Terabyte) of produced data.