<<I'll believe it when I see it. I still believe that Nikon has decided that "pros", and amateurs with pro money, should upgrade to FX>>
Not sure I agree with that. Nikon are not going to allow Canon to produce a new 7D without an appropriate response. I believe both will arrive close together. I seriously suspected a D400 would not come, but also that we were coming to the end of DX cameras, I will be very pleased to be proved wrong
<<The D600 is a hell of a camera that is 95% of what a D400 would be, for probably less than half what a D400 would cost>>
No doubt it's a "hell of a camera", but it won't satisfy serious wildlife and Sports photographers. The D800 is one hell of a camera, dependant on ones point of view both the D800 and D600 do not really do 95% of what a potential D400 may do. Extra reach is achieved by DX crop, fps is too slow for some and image buffering has to be more respectable.
I am happy with my D7100 and D800 for wildlife, but a D400 is likely to be much different to both of these to attract its target audience.