I've got a D800 on order. We'll see how long it takes.
My thought process is that the photosites and pixel density are bout the same as the D7000 - which I have and like. Like the D7000, more pixels will mean AF issues. Expect to see more viewing at 200%.
The anti-aliasing filter is used to prevent moire. This is an issue with patterned subjects - fine feather details, shingle roofs, fields of grass, fine mesh, lace, etc. The AA filter creates a little intentional blurring that is corrected with sharpening. It is possible to correct some moire in post processing, but it can also be very difficult to fix.
I shoot more landscapes and macro than sports, photojournalism, and weddings. I'm giving up a bit of low light performance which would be important for wildlife and this is a concern.
I rarely shoot bursts of images. Typically a 2-4 image burst is plenty given my style.
I already have all the FX lenses for the FX body.
The battery compatibility with the D7000 is a plus.
I can't wait to hear hands-on reports.
I expect ISO performance to be about 2 stops worse than the D700/D3, 2 1/2 stops worse than the D3s, and 3 stops worse than the D4. That's okay for me but a little bit of a concern for wildlife photography which occurs in lower light.