I'm sorry...but after this much time has elapsed, it seems unavoidable to conclude that Nikon has chosen to ignore this segment of its market. The D300s was never an upgrade for the D300...except for the YouTube video makers, and few of them I'd bet. The D300s which have been sold were the result of those buyers not having a choice, if they wanted the top of the line prosumer APS-c DSLR.
And the D800 is tangential, not sequential to the D300. It does not carry forward the features of the D300; it is for a different market segment. That some D300 users have bought the D800 can be put down in many cased to...wait for it...AGAIN, no other choice.
I waited, and waited, was frustrated, expressed frustration, and final threw in the towel. My DSLR cash fund went instead to Sony, for a prosumer level video camera. I'll remain in the DSLR dead end that the D300 has so far led to.
It brings a wry smile to my face every time someone suggests that the D400 is just around the corner. It isn't, of course, but for me, and numerous others, it no longer matters.