I believe this rumor is true. Didn’t Canon announce a while back ago that they would step up their game? It seems obvious that Canon has to do something aggressive to gain a larger portion of the higher end mirrorless market. Sony has gained a stronger position in that market than Canon can be comfortable with.
I am very curious to see the design, the ergonomics and button layout. I hope And believe they adapt many of the 5D series solutions. I really hope they add that new AF optical AF point selector on a AF back button, as seen on the 1DXIII.
Another major challenge I wonder if Canon has solved, is the somewhat laggy response the R suffers from. By that I mean the R doesn’t really respond very fast when you press the shutter. It seems that the camera need a little time to fine tune it’s focus before it release the shutter. Don’t get me wrong, that is a good priority on Canon’s side, but it makes the shooting experience less satisfying. Pick up a 1DX and hit the shutter, compare to the R, and you will understand what I mean.
I have little doubt it will have two card slots. It will be interesting to see how they have improved the sensor performance.