The only reason the Nikon D900 is getting the light of day here is because Thom Hogan is leaning toward a D900 model over the introduction of a D3x. He said:
I’m going to go a different direction: no D3x. Yes, a 24mp FX body, but it’ll be the D900. This allows them to use the Sony sensor and bring it downscale to compete with the A900/5DII.
Thom’s usually got a pretty good ear to the ground on these things, so there may very well be something to the D900 (or maybe a D800).