If you use Google+, check out Scott Kelby's comment on the D800. Essentially, he stated that we all have to get the camera that fits our needs. I agree with his point that "The D800 was apparently created for a very specific type of photographer. There is no law that every camera introduced by a camera company has to be designed to fit your personal needs."
Personally, I'm excited about the D800 (and the D4, but my wife would kill me!) I do art festivals all summer and routinely sell 20" x 30" prints. I am beginning to get requests for much larger prints and the D800 would definitely make my large photos improve. I also like the option to be able to severely crop an image, so having the extra pixels would really make my life easier. I'd love to have a D4 for its low-light capability because I do a fair amount of low-light work, but that will have to wait. I could make ISO 6400 work for much of my work.
"The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt." - Bertrand Russell