We have Canon suggestions further down this forum, so why not Nikon?
I'm happy with the D2x, but after using it for a while, I do have a couple of things...
Why don't pro DSLR's have a rotating view screens on the back like a lot of P&S cameras? Are the rotating screens not strong enough? If they could be made strong enough, they'd be an advantage, especially in such things as macro photography and landscape work, even though they're not 'live.' They'd also be useful in bad light situations where you can't move the position of the camera, but you could see the screen a lot better if it were at, say, 90 degrees to the camera. (I'm thinking basketball courts and football night games, where the lights are always behind you, shining into the screen.)
If it were possible to make the screen "live," that is, to add an electronic viewfinder while retaining the optical viewfinder, that would be great, and a special advantage for photo-journalists, who sometimes have to shoot with their cameras overhead, and for macro shooters of small moving subjects like insects, or flowers on a windy day.
We seem to be getting to the point where only two or three SLR makers are going to survive; a big part of that survival is marketing, and raw pixel count means something for marketers. Everybody, of course, wants their system to survive, because of the investment they've got in it. I suspect the thing that many Nikon people would like, as a survival mechanism, is a full-frame sensor as a way to "catch" Canon. Not me. I like the advantages of the small sensor, but wouldn't mind going to 1.3, if that size would retain the DX lenses.
I would also be interested in a change in the aspect ratio to the golden section or something even closer to square (but not square) like 4:5. That would boost the pixel count for the marketers and give a more functional aspect for photographers.
We need a high-quality modern wide-angle shift lens; we could use a couple of fast wide-angle primes.
Otherwise, I'm happy. I thought the F5 was close to a perfect camera, but the D2x is even better, I think.