A regional camera store that has a shop in my state has had the R3 on its website several time over the last few months. Last one a few weeks ago, another appeared today. They seem to be trickling in.

I went ahead and bought one. I have been thinking about getting one lately, so I went ahead and bought it.

I haven't been to excited about certain aspects of the R5's performance, and it is areas the R3 should excel at.
The real kicker for me is changing lenses. I have always had two bodies, one on the telephoto and another that is walk around. If you own a compliment of RF lenses it doesn't make sense to have the 5DsR or 1D IV. Changing back and forth is a pain.

I need to unload most of my EF lenses and bodies.