"Canon is naming the body differently too. Rather than calling it the EOS-1D Mark V, thereby carrying on a practice that began when the EOS-1D Mark II came out in 2004, they've broken with that convention and called it simply EOS-1D X. The X, says Canon USA Technical Advisor Chuck Westfall, is meant to suggest three things about the new camera:
X for extreme (X-treme) performance
X for cross-over (X-over), since this represents the merging of Canon's two pro digital SLR cameras, the higher-resolution EOS-1Ds Mark III and higher-performance EOS-1D Mark IV, into a single next-generation model
The Roman numeral X, as in 10, because the EOS-1D X represents the 10th generation of pro-class SLR from Canon since the F-1 debuted in 1971"
Not that they would outwardly state they have another high end body up their sleeve still, but I find it very, very difficult to believe Canon will abandon the MP race or just leave it up to the 5-series...unless the 5-series get a big boost on other fronts that is.