Since I still have many readers asking me about it - those are the shipping dates for the Nikon D4 and D800/E confirmed by Nikon France in a recent Q&A sessions:
"Le D4 sera commercialisé à partir du 15 mars 2012. Le D800 à partir du 22 mars et le D800E à partir du 12 avril."
Translation: "The D4 will be sold from March 15, 2012. The D800 from March 22 and D800E from April 12."
Nikon's representative also mentioned that the D700 will still be available for sale alongside the D800/E. The price of the D700 already dropped in Europe (£450 less in the UK: £1,799.95 at Amazon and Jessops). Still no word on a price drop in the US where the D700 is out of stock everywhere.
Update: of course an hour after I published this post online, Amazon got the D700 in stock - the price is the same.