Personally I think the D400 rumors are to string along D300 users who don't want to switch to FX. I imagine we eventually will see something like what we are looking for but it will be FX. It is very curious that Nikon seems to be further dividing their established markets with things like the D90 and more recently the D600.
I surmise that the D7000 will be the last DX body that I will buy. I am also becoming convinced that my current lineup will be what I use until something breaking forces me to change equipment. As I have said elsewhere my low light action needs have evaporated making the equipment I have more than adequate.