In an interview around the time of the pixel shift firmware update for the Canon EOS R5, a Canon executive claimed that Canon wasn't even working on a follow-up
Large-caliber Canons – two bodies, four lenses, two teleconverters and a printer. - Luminous Landscape
Which camera is better: the Nikon Z9, the Canon R5, or the Sony A1? - Quora
Canon Celebrates Significant Milestones with Production of 110 Million EOS Series Cameras and 160 Million Interchangeable RF/EF Lenses - Canon HongKong
Canon R7 vs. OM Systems Olympus OM-1: An In-Depth Camera Comparison & Review — Oxbow Photography
Canon 2020 - What Is Coming Next (EOS R6, EOS R5s, Lenses)?
Canon EOS R6 review: A perfect hybrid shooter with a big video flaw
What does the EOS R5 tell us about Canon's mirrorless plans?: Digital Photography Review
Canon EOS R6 MK II Review
Why the Canon EOS R5 could be 'mind blowing' for video, according to a director