More megapixels is only part of the problem.
Better megapixels is the more significant problem that Canon faces.
If it simple scales up any of its current APS-C sensors to full frame then it won't address the megapixel quality problem.
On the other hand if it gets a 46MP sensor from Sony, well, all bets are off....
Sir, I do not think, that Conon will release an "bad-sensored" camerabody. Maybe the IQ is not the the IQ you get from the Nikon D800E or Sony A7 36MP. I hope - it will be on an equal level like the IQ of todays Canon products.
Just think of, what will happen to Canon if this Camera is rubbish? They will never release an under-average product.
Maybe it took so long to developa an good high MP sensor.