We expect the Nikon D800 to be announced in just a few weeks. The Nikon D800 Specifications continue to trickle in the form of rumors that paint the picture of a very desirable camera. Many of the previous gripes with the D700 are being addressed, including a new 100% viewfinder (the D700 only had 95% coverage).
The auto focus system will also be improved. Hopefully it will have a wider spread of points, and not just an increased number. The previous points were clustered in the center, creating frustration when trying to compose with the subject off center. One novel feature that is rumored to be added is face recognition.
Nikon Rumors mentions that Nikon has been acquiring USB 3.0 chips. These could allow fast in-camera transfers for those with the latest hardware.