I'm sure it is old stock being redistributed as well as a lot of refurbished units are coming out as well. Price is still below the D800, and the D800 will not be available in stores (as they will be spoken for) for quite some time. Prices will hold steady, plus Nikon now has control over pricing.
I have watched so many videos I can't find it in my history, but I know I saw a Nikon rep say they can not make any more and quoted the updated battery laws in Japan saying they can't build any new devices that are not in compliance. Currently FX camera are only made in Japan but it did sound like they could start up Thailand or China if another disaster hit. CarryCableGuy, posted an interview (on the D800 thread) where a rep said they could build more, but I think that is a "save face" move as Nikon knows many wanted a lower resolution, high ISO camera in this realm.