How big and heavy are the associated R camera as going to be? The RP and SL1/2/3 are only slightly larger than the M5 and almost exactly the same weight. My M5 with the Sigma 16 f/1.4 C lens is an absolute joy to carry compared with the 5D3 and Canon 24 f/1.4 L lens and most of the weight difference is in the body itself.
I think you'll see a range. I saw an RP in the store and it was small which I could see some value in for a travel body. I wonder if that will be the progenitor of the 'rebel' line replacements? Hopefully they keep something in that form factor. I think the R5 will be big like the 5D series. And a 1 series R will likely be larger still. Once a full line is released, I think they'll have it all covered.