here the statement from Summit Entertaiment :Breaking dawn release date officially announced
Director Bill Condon takes a long time to convince fans of Twilight that he was perfect to do this. Summit Entertainment did not confirm that Breaking Dawn will be split into two movies - Breaking Dawn will be running it in theaters on December 18 november 2011 nearly 18 months after the Twilight Saga: Eclipse that will run on 30 June 2010.
u can see my artikel about Release Date Movie Twilight : Breaking Dawn With List Actor And Kru
I go on www.imdb.com it's a movie website with a lot of info on movies and actors and all that kind of stuff and it's reliable info (it's not like wikipedia for example)... But there isn't a lot of info on Breaking Dawn at the moment (it's too early ^^ )