Canon's RF 70-200mm lens looks a great option, for people wanting a f/2.8 lens in a compact design. Time will tell how well it handles harsh environments (moisture, dust, etc) - as indeed externally zooming lenses do by default let in more dust than the internally zooming versions. In that respect, the 70-200mm EF lenses are very well sealed. I have used a number of them over the years.
I currently own a number of L lenses, including the 70-300mm L - which is one of my favourite lenses. One of the main reasons being that I love its size and compactness, while still having great image quality and a very versatile / useful zoom range for much of my photography. I have used it extensively since I bought it (within the first month it became available) - and my lens has a small amount of dust inside it, but all the dust particles are small (and few) - so this is in no way impacts image quality (with different light scenarios).
The placement of the RF zoom ring and 'other ring' (which I believe might be a control ring, which can be 'switchable' between focus or other functions) - is similar to my 70-300mm L. I have no problem with the placement of that - in fact I find my 70-300mm L very ergonomic on both my 7D and 80D, as well as on FF bodies I have used it with. I also find I am adjustable to use the 70-200mm L lenses which have the zoom and focus rings in the other sequence (zoom closer to the body).
So, in summary, yes I'm looking forward to reading more news, hearing both professional reviews as well as 'real world purchaser/user reviews' of the up coming Canon RF 70-200mm f/2.8
Now if Canon could just come out with a FF mirrorless body that will tempt me (and my wallet) ... Yes, I have used the Canon EOS R extensively (borrowed from friends, used on photography outings, in store, etc), and while it has a lot going for it, the EOS R has a number of limitations (fps, etc) and also misses a number of features that prevent me being brought over to the RF mount just yet.... However I'm sure that a future and improved RF mount camera body will.....
It's a great time to be a photographer!
Paul