It is indeed very true that a new replacement may be rumored for those with the "must have the latest" appetite. However, if economic factor is taken into consideration, the new model may be priced near $1,099 range. Whereas consider this as an "end of product cycle" deal, the current sale at Henry's Camera for $829 is a very good price for a very good Nikon DX format DSLR.
As from the experience of the D700, a great many purchased it at the end production cycle price of $2,300 before the D800 with a 36 MP sensor was released. A great photographer friend of mine recently made the move for the D7000 after he was informed of a similar sale at Downtown Camera, having relied on an old D200 for a number of years. As for myself, I am eternally grateful to have the D700 without the burden of the mega-pixel files and a necessary preference for the Nikon's "holy trinity". As for the need for the latest, it became known after the fact that the new D600 has an issue of the sensor contamination as well as an inadequency of AF area coverage with the AF sensor module from a DX onto a FX format body.
The moral of the story is that whether the latest at the highest cost is desired or an excellent product at a great value be more preferable.
Good birding and photography.