If it goes EVF ... will Canon make it mirrorless? No more mirror-slap would be good!
Interesting to see how far Canon will go with this...
But obviously they're preparing themselves to do mirrorless in an SLR styled body, a la Sony A7.
I would think it'd have to be mirrorless - It doesn't make any sense to have a mirror relay the image to a secondary sensor for the EVF?
At that point though you have to start questioning why the need for a live display on the back and a tiny one with a magnifying glass that you can...see the exact same thing on the larger display with. (Bright light conditions being one problem an EVF solve but I think that could be resolved some other way.)