I would buy this $1,999 D400 in a heart beat

MY guess is you wont have to pay 1,999, more like 1,600 and for an amazing Sony 20MP AA-filterless  sensor. ISO 200-25600 standard. Same other specs as D300 + HDR, GPS, Wireless etc....

But the waiting orders may be quite long. Dont expect to get your hands on one for at least four months when it comes out... 

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.....Just from an amateur......''Sometimes it's to your advantage for people to think you're crazy.” I am only a hoobyist, I cannot and do not give expert advice, dont expect it, just take it as a suggestion to think about, but only if you wish to. We should try to not wait for life to happen, while it passes us by.