I don't understand why Nikon would put a 24mp sensor in a D400 - seems like that would put it too close to the D4 line. I am expecting to see somewhere around 16-18 MP in the D400.
The D400 is also rumored to be a DX sensor body, so the comment about FX doesn't make sense. My take was it was to be 1 FX body (D4) and 1 DX body (D400)
Of course, it's all rumors
Jen, I bought my D700 about a year ago, because I was tired of the rumors of when the D700 replacement would arrive. Glad I did, as I've been enjoying using it for about a year now