Signed up to put in my two cents on the wish list. In order of priority:
Significantly better DR by say...at least 1.5 stops.
Very clean images at high ISO's. Perhaps 4 stops better than we have with the 5dII.
Slightly more resolution, but not at the expense of the previous high ISO performance or DR requirements.
I would pay much more than a paid for my II to get it, and I'm sure I'd have to.
Your wish list is similar to mine, RSBJ, but I don't think 4 stops better at high ISO is going to happen any time soon. It may not even be within the realm of physical possibility given the quantum nature of light. My rough estimates put the top DSLRs currently on the market within about 3 stops of an ideal sensor limited only by photon shot noise. (No, I don't have any references handy for my back-of-the-envelope calculations.) I'd love to be wrong though. High ISO performance is vital to my needs.