The new Nikon D800 photos have been posted on NikonRumors.com, and the admin stated he believes they are real. Several key points can be gleaned from these photos. There is a pop-up flash, similar to the D700. The overall layout and buttons are very similar to the D700. There is a video mode, with a switch on the back to easily go into video mode. The camera is pictured with an optional battery grip.
Included below are enhanced photos of the D800 to show some of the shadow detail. The Nikon name and model number have been blacked out. The small square blacked out below and to the right of the lens mount is usually the location of the FX logo (as seen on the D700).