I'm not sure if anyone else follows other companies camera rumors but this came through for the 5d mk III:
The 1D-x came out with 18mp (& did away with aps-h) giving up on the Higher mp going backwards. Anyone else think this is significant and rather telling? Better Low ISO over resolution?
Not completely. Canon did this a while ago with the G (G9 to G10 to G11) series but I think they are worried about Nikon and Sony. The D3 was a big punch and the D7000 confirmed that Nikon's cameras still over qualify their own bodies. Up to the 1Dx, all of their newer cameras only outspeced nikon in megapixels and video. With the 1Dx they outspeced the D3s in almost every category on paper and a field test may prove it to be a winner. However they were keen that the D3s & D3x were better than the 1D mk4 and the 1ds mk3 (and the 5dmk2 wasn't helping) so they pulled their pro bodies out of the way of their 5D series to focus on competing with Nikon's stable.
Sony hasn't played a full card but the a900 and a77 prove that they are capable of coming out with a winning pro body. Their problem would be getting rentalhouses and ad agencies to accept them. Canon realizes that they need to rethink how they sell pro gear and they are giving it a shot. There is too much at stake for them as competition is getting increasingly competitive in the pro and advanced amateur market. (My personal 2 cents though)