Confirmed..
http://nikonrumors.com/2008/11/28/d3...available.aspx
http://www.engadget.com/2008/11/28/n...-pro-magazine/
D3x will sport an FX-format, 24.5 megapixel sensor shooting 5fps at full resolution or 7fps at a reduced 10 megapixels. Nikon made a few other tweaks including an extended ISO 50-6400 range but the body design, AF, metering, and main functions remain the same as the D3.