I think some people are missing the point about Canon using the 18mp over and over, who cares if the next camera has 18mp resolution, might as well have less, it's about how they've been using the same sensor for every release post 7D. That's insane, from 7D to 60D to every rebel and M, I have a friend's 60D on me now and good grief ISO 400 and the noise can't touch that of the 5DMk2, daylight fine, but indoor I can't just shoot at 3200 and brush up some loose noise like with the 5DII and that's even older now. Feels like sensor tech is in a standstill since 2008, of course FF beats Crop, but 5yr old FF beating the crop sensor that Canon proudly presents in 2013?? If they don't stuff something worth it in the 70D then the 7DMk2 better or.... I might just break and throw them more money for an expensive FF (cursing Canon and wishing I made the move to the dark side, Canon video hasn't budged either and just sucks compared to everyone else nowadays.)
The 5DMk3 is good but not 'that' much better over the Mk2, I'll choose that if I could spare for it, and the 1DX sure, but that's an impossible league for most.
So, YES, will be disappointed if the 70D had the same sensor