Rumors are is that the R1 will be larger than the R3, but again those are only rumors and it did not say how much larger or in which dimension(s). As an owner of a R3 I find the ergonomics and weight ideal. The R1 is going to have two CF Express slots so it will have to be larger. The question is how much.
There were no nano machines in the COVID vaccines. They put them in the Ivermectin that the anti-vaxers were using since those are the people they want to track.
It sounds pretty great, but I'm skeptical. Are they really going to cannibalize the R3 with a Stacked 62MP sensor camera that probably will do at least 20 FPS. Doubt it. Looks more like R1 specs.
Canon probably (correctly) thinks that they've already sold the vast majority of the R3s that they will ever sell. It's been on the market for two years.