Over at a German Canikon community, a forum poster says he’s got some new rumors on a D3 replacement from Nikon (via Google Translate):
The latest information from the NPS say that environments later this year or likely D3x Nikon Nikon D4 and announced no later than the Nikon Solution in February also will be available. It will be a resolution of 24, x MP in a series of image speed of 5-6 pictures. The new D3 is to replace and not run parallel what astonished me first and also excited.
For past and present D3x rumors, keep your eyes on Photography Bay’s Nikon D3x Rumors page.