5D3 will be a game changer for many... Canon better do it right.
Agreed. Just as Nikon's D800 was a "game changer". It's turning out to be a very interesting year for Canon & Nikon fans. All Canon needs to do (in my mind) with the 5D3 is to include the recently mentioned spec list here at CR + 100-12,800 native ISO (or 100-51,200 as in the 1D-X).
For those Canonites hoping for a 40MP EOS camera...wait for the "3D" or one of the "Cinema EOS DSLR" cameras.