I have read careful the thread... in the last page many people are discussing about the 1Dx performance; Yes, 1Dx is a very, very good camera... but i believe 90% of the forum readers consider the Canon flagship out of their reach or too expensive for their needs (including me).
I use the DSLR in light controlled situations , 95% under ISO 320, In studio, commercial, portraits and stock photography. In my work field size matters ( I mean MP )... high ISO performance , frame rate are not so important. What should i choose ?? 5D3 or D800?...
I believe Nikon answer to the majority of my needs.
If canon release the MP monster in 1D body ; than certainly the price tag will be around $9000. In this case what will stop many pros for getting a Pentax 645d Medium format instead of a Canon FF with same resolution?? The IQ will be incomparably.