This is how professional dSLR layout should look like.
D4 layout? No thanks. Even Sony realized, that more external controls is good thing (NEX-7 layout). Yes they made few mistakes (like that those dials need LOCK and they dont have it :D), but idea itself was good.
If they create A99 with layout similar to A900 (or same) then good luck with D4 Nikon. Btw. that 16 mpix will be used in one of Sony future FF.
funny how people talk here like they've already owned the D4/1Dx or even tried the camera. Honestly? Let's all admit that it all boils down to your photography skills.