this is my wishlist for 5D Mark III:
Autofocus 19/45 cross-type AF points - AF points spread all over the frame
A more accurate spot-meter linked to AF point
Extended Dynamic Range
16-bit color
5-6 Frames per second
100% Viewfinder
User Configurable Auto-ISO
ISO 12800 usable, about 2-3 stops or cleaner than 5D Mark II
GPS
Dual axis electronic level
Bigger, Better and Brighter Screen
Dual card slots
Better weather sealing
Autofocus 19/45 cross-type AF points - AF points spread all over the frame
A more accurate spot-meter linked to AF point
Extended Dynamic Range
16-bit color
5-6 Frames per second
100% Viewfinder
User Configurable Auto-ISO
ISO 12800 usable, about 2-3 stops or cleaner than 5D Mark II
GPS
Dual axis electronic level
Bigger, Better and Brighter Screen
Dual card slots
Better weather sealing