What strikes me odd is if Canon makes this camera, it would mean their highest MP camera would be an APS-C format body, not full frame. That just doesn't sound logical, why would they do that? This camera would have a pixel density equal to a 61mp full frame camera, that is far beyond the resolving power of most lenses. I doubt this camera would really come anywhere close to the IQ of the 5DmkIII, that is just wishful thinking, at any ISO.
This DSLR is not aim at user who image quality is their highest priority... get FF DSLR for that.
Basically, "Image Quality, Performance & Built and Price"... choose 2 of them:
1) If you want image quality and better price, performance & built will not be good -> Canon 6D
2) If you want image quality and performance & built, price will be high -> Canon 1Dx.
3) If you want performance & built and better price, image quality will not be as good -> Canon 7D.
Anyway, base on my "eyeball" compare, 6D is 2 stop better than 7D in noise performance, so if this DSLR can have 1 stop better than current 7D, I'll be happy.
Have a nice day.