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Peter McKinnon has posted a video showing a couple of Canon EOS R3’s in his possession. He is not allowed to post and videos or photographs taken from the camera as of yet, but he does give a rundown of some of the features and size comparisons between the EOS R3 and EOS-1D X Mark III and EOS R5.
There’s a cringeworthy Squarespace plug in the middle of the video, but other than that, it should give you a bit of insight into the R3 and how it may handle.