>I'm excited about the new body but, for me, they have waited >too long. Needing a body with better high ISO noise and >dynamic range performance I bought the D800 and upgraded my >long lens. I won't be going back to the DX format.
I'm pretty much in the same boat as you Bob and this applies to many of us, Richard shoots a lot of FX now also. I have two FX cameras and I pretty much shoot those exclusively now, even for Birding. My D7000 gets stuffed along in a bag but never gets a chance to come out and play. I think I should seriously consider selling my D7000 as I stumbled into a local used 120-300mm yesterday and that could really be useful in 3 or 4 ways to me. Good glass is of course always useful.
I still like the idea of owning a D400 but it will have to vie with my FX cameras for shooting time. And if it's got some enhanced video and a new AF system I'd like to save up and add it to my kit. I'm a Birder so the digital reach (and without AA filter) sounds good too of course.