Gina McIntyre from Los Angeles Times, had the opportunity to chat with the movie’s producer Wyck Godfrey and here’s some extracts of her interview:

No decision has yet been made as to whether or not the Breaking Dawn novel will be split into two scripts (and two movies) or one. But we’ve heard that before. What is news, though, is that he is all but confirming that New Moon director Chris Weitz will NOT be back to helm Breaking Dawn, one film or two. He’s also confirming that the three stars are on board and the plan is to begin shooting this fall in Vancouver.

As for breaking up Breaking Dawn into two films, “It’s a work in process,” said Godfrey. “The issue [of whether there will be one or two movies] is not going to be resolved until we get the full treatment and see whether it’s organic. If it’s not organic, I don’t think it will be done, and if it is, it will be. It really has to do with how much level of detail from the books there is, with all of these new vampires that appear in Breaking Dawn, the whole section about Jacob…It’s a very long single movie if it does become a single movie.”

The three principal actors, Kristen Stewart, Rob Pattinson, and Taylor Lautner have apparently completed their negotiations and are “signed,” indicating that Summit may have brokered a deal which would cover either one or two movies. Twilight, New Moon, and Eclipse screenwriter Melissa Rosenberg is back on board and hard at work on what will be either one or two films, but whatever the outcome, Breaking Dawn will be made “with an eye toward beginning to shoot in Vancouver this fall.”

Source.