I would like the option to switch around the order of the main menu's, like have the AF-tab next to My Menu, and the possibllity to have one more My Menu, or being able to add a few more items to the one there is.
I would like red Af-points.
The old 1d4 iso button/placement (although no biggie)
The same lowlight AF ability of the 5d2.
5. I find reaching the M.fn and dof-preview buttons kind of hard, they should be bigger or closer to the grip for my liking.
More options to customize buttons. (Why can't I set every button to whatever?)
Support for the EC-S focusing screen. Seeing the dof and focus is a great aid and truly missed from the 5d2.
All of this minus the red-af point wish, is nitpicking. I must say this camera, it's just f@@@ing EPIC!! I have used almost all Canon bodies since the 1ds2 (owned or used) and this is so near perfect it's ridicolous. Like no other Canon before I can catch moments that are completely out of the question for what can be done with AF, and it just does it.