One guy with Canon connections said months ago that we'd soon enough realize that Canon held back their new sensor tech for the 1DX so they could re-use the old lines once more to raise margin on the 5D3 since they felt that all the body upgrades were enough this time to not force their hand at the 100% new sensor tech.
That sounds plausible and would have worked if it wasn't for the competition. Lets hope that Nikon forces Canon's hand now to release a 5d4 sooner than 4 years from now :-o ... imagine what Intel products would be like without AMD.
Did the guy predict what would be the next body to have a real sensor upgrade after the 1dx? The 70d? The high-mp eos?
I agree and this bodes well for the 1D X.