Wow! So this R is the MIDDLE camera of the lineup? Since they're touting it's supreme IQ, I'm guessing it's their A7RIII competitor?
Sheesh... so we're going to get an even lower spec'd one. That's almost embarrassing compared to what's on the market already, and sounds like they're just basically going for a stripped down model to be the price leader (assuming it's still FF). If it's a cropper, EOS-M is officially dead, and the EOS-M lenses can't be used on the R-series. Seems like a silly move to alienate all of those people who have M's.
I call BS on that IBIS statement regarding cost, overheating and size since A) Sonys and Nikon Z have done it CHEAPER than the R in their own bodies, B) I've never heard of overheating issues due to IBIS. 4K, yes, but never IBIS. None of my 3 cameras with IBIS have ever overheated. C) size? The Sony is smaller than the Canon, and the Nikon is roughly the same size... so that's obviously false. Olympus puts IBIS in the OMD EM10's and those bodies have relatively large MFT sensors considering the body is the size of a small P&S camera.