Source: optyczne.pl.
Optyczne: The first reliable rumors about D3x Nikon emerged in mid-April 2008. In the article''The full frame 24.4 Mpix in Nikon D3x?''Wrote the software for 1.10 to be D3. The code of the software found a string corresponding resolution matrix 24.4 megapikselowej. It was therefore clear that the manufacturer prepares lustrzankę based on D3, but with more pixels. (... Read more/translate.google)
Nikon D3x - Test