A major mistake on the price. Is this camera so good it warrants a launch price double the high street price of the previous model, and 25% more expensive than the D800? Somehow I doubt it, the improvements seem very incremental over the MkII, and while that camera sold in massive numbers I'll stick my neck out and say that this one won't.
I'm going to hold off buying one, I'm convinced Canon are going to get a shock when customer demand isn't any where close to what they expect, and that the price will fall quite dramatically within 6 months of launch. I bought the 5D MkII soon after launch with a battery grip and spent Â£1900 I'd now have to spend close to twice that for a camera which isn't going to give me twice the image quality.
For me it's a big thumbs down I'll keep my cash until Canon get some sense, I remember the outcry of Nikon shooters over the D3x price, and a lot of them boycotted the camera, it didn't sell well at all, this is how I see the MkIII, it's just not enough of a step change to justify the price.