Deb,
I had a D3X in my hands about three weeks ago. Basically a D3 with a 24.5 megapixel sensor. Nothing external distinguishing it from the D3 other than the X in the name.
Official announcement is now scheduled for December 1 - about two years later than originally planned!
XXXXX XXXXXX, a close friend who is a field tester for Nikon in Japan, says he prefers the D3 to the D3X due to the difference in color fidelity and saturation.
I have a D3X on order and expect delivery after the first of the year. Price is stated to be $5500.