Having realised that there is a market for the D3 sensor in the D700, I hope that they'll realise that the same is true for the D3x (D4 whatever). I would have thought that this time they might be tempted to bring out the smaller version first (to nip Sony in the bud with the A900).
Actually, while I can see the need for the bigger D3 body for PJ and sports photographers, I'm not so sure that the Studio / Fashion / Travel / Landscape photographers who will want the higher pixel count are going to want a big body (I certainly don't).
I thought that my time with the 12mp sensor would be just until the higher mp sensor arrived . . . . but I actually want both now - the DR, high ISO and resiliance of the D700/D3 files is so great -