Nikon today announced the long-expected and not-so-secret D3x. I have a full article of commentary here, so I'll restrict this front page entry to just the basics.
The D3x is basically a D3 with a different sensor module (and all that implies: low-pass filter, ADC speed, etc.). The 24.4mp (6048 x 4032) lowers the frame rate to 5 fps (7 fps for the DX crop) and the available ISO values change to 50-6400 (100-1600 numbered). But the other things that make a D3 a D3--the autofocus, metering, dual-card slots, controls, size/weight, and so on--all remain basically the same.
Nikon says the camera will be available later this month for US$7999. Yes, you read that price right.
For more, read my longer commentary.