All over the web is the news of the Nikon D3x: 24.5-megapixel full-frame sensor, 5 frames per second, ISO 50-6400, and 16-bit EXPEED processor. Presumably that means 16-bit processing, but with the RAW files remaining 14-bit.
With the 24MP Sony A900 already on the market, will Nikon price the D3x aggressively? My guess is no—they are two very different cameras with different quality viewfinder, build quality, etc.
The big and very interesting question is this: with all the theory about downsizing a larger image to a smaller one, will a 24.5MP D3x image downsized to 12MP (D3 size) be as good at low ISOs? I doubt so, but it should prove interesting. See DAP for more on this noise issue at high ISOs.