This will undoubtedly be a solid and very capable camera. For pros (photo-video) having used the 5D2 for three years or so, I guess the upgrade is worth it because it mostly addresses their concerns and wishes. Now, for me it looks like Canon did not want to make ripples, and capitalize on a successful model, especially in the video compartment. I read somewhere (sorry for the author but I can't remember where and the detailed argument) that 22 MP is the perfect number for video in terms of whatever scaling, compression, sampling etc.
Expensive, conservative, solid. But no thrill. A bit like Toyota cars. I am left with the feeling that something is brewing somewhere in the digital imaging world. New developments are coming from here and there and it looks like Canon has no immediate answer. My gut feel is that they just released conservative models to satisfy their base customers ( hence the name 5DIII). while new stuff w/ higher pixel count or whatever makes photography more thrilling is being developed.
I'll wait for comparative reviews of those recently released beasts. Since however it's my belief that we are soon going to see some 3D or 4D or even 6D with more oomph, I'll willing to wait a few more months and see.