Well after reading of the Canon 50d and we only have a couple weeks away from the big show. I wonder what Nikon still has up there sleeves. There is no way there done. There has always been a cat and mouse game between Canon and Nikon so they have to be saving something else. My bet is more glass and a 24mpx D4 that is a slower camera than the current D3. This one for image quality over the speed of the D3. Which to me makes perfect market sense.
Thoughts and guesses