We report, you decide (the original source is here):
Model name: Nikon D3x (may change to D4)
Specifications (where different from those of the Nikon D3)
Maximum resolution: 5960 x 3964 (23.6 MP)
Sensor details: 35.9 x 23.9 mm FX full-frame CMOS, RGB, made by Nikon, Inc.
AF: Nikon Multi-CAM4000 DX (provisional name)
ISO range: 100-6400 in 0.5 or 0.33 EV steps (50 – 12800 in menu mode)
Maximum speed: 6.5 fps @ 23.6 MP and 11 fps @ 10 MP (almost up to the D3)
Movie mode: Yes (may be withdrawn because of import duty rates in US/EU)
LCD pixel count: 1080000
Weight with batteries: approx. 1.4 kg
MSRP: USD 6750
http://www.snipurl.com/5ac80b4 (or google it this got taken down once)
Comments: Sensor noise performance is only marginally below that of the D3,
so D3x noise at say 200 ISO = D3 noise at 400 ISO. Expected release date
April 2008 but if likely to be delayed I predict it will be announced as
the Nikon D4.