On several occasions in the past, Nikon representatives mentioned that the D800 is not the replacement of the D700 but “a whole new category of camera”. There are rumors of a new, cheaper full frame DSLR camera from Nikon that will be called D600. Here are the preliminary specs:

Unknown MP count at that point

The new camera will be marketed as an entry level full frame camera

Auto DX crop mode

Dual SD card slots

In-camera RAW editor

Built in time-lapse functionality

There will be no build-in HDR feature

Possible integrated GPS

New external battery grip

To be released this summer

As usual, information about products that will be released several months in the future are not very reliable, so I would rate this rumors at 40% probability for now. If this turns out to be true, it will change the whole dynamic in the Nikon product line - maybe we will end up with three DX models D3x00, D5x00 and a high end D7x00 (all with 4 digits names) and the rest will be full frame cameras - D600, D800, D4 (with 1 and 3 digits names). I still believe that Nikon will release two more DSLR cameras in 2012.