A reputable list has a posting of what the poster believes to be the Japanese price for the D3x:
…898,000yen. [ed: That's $9,431.69 per Google today!]
Whoa, that’ quite a bummer. Basically as of today I could buy 4.5 D700 with a resolution of together 54MP for the price of one D3x.
I guess this prices translates [...]

From a reputable list:
Subject: Re: Nikon pro mag
Date: Sat, 29 Nov 2008 01:09:05 +0900
I phoned Nikon UK earlier today and they said that although they cannot give any information yet, to phone on Monday when they should be able to reveal all.
Apparently the magazines should have been sent out on Saturday so that they would [...]

Reportedly from Nikon Pro magazine (Euro? Note the British spelling of “colour”, etc), supposedly NOT fakes (click for larger images):
Confirmed. Not Fakes. (click for larger images)
Summary
So what are we looking at- basically a FF D2x sensor in a D3 body– should make the landscape and studio guys happy, I’ll stick with my amazingly good high [...]