This is a post in a german forum:
There are new rumors. New information from someone near NPS says that there will be a Nikon D3x or more likely a Nikon D4 announced this year which we could buy latest in February next year. Resolution will be 24,x MP with a burst of 5 to 6 fps. The new camera should replace the D3 it´s not going to be sold parallel.
This is interesting because it matches the November 20th event and the BIG February announcement.