I en inteervju med Melissa Rosenberg, kvinnan som skriver manuset till våra kärleksfilmer berättade hon detta!
(Sticky direkt från Newmoonmovie.org)

In your script for Twilight, you wrote in a number of direct quotes from Stephenie Meyer’s book. Can we expect the same in New Moon and Eclipse?

There are definitely some quotes sprinkled throughout. In some cases I’m paraphrasing, but I do try to include as many as I can. It’s very important. It brings the flavor of the book into the movie, so I definitely try to.

Fans want to know: Did the proposal scene make it into New Moon?

The proposal comes into the end of New Moon, and that is the first proposal. Absolutely in Eclipse, the proposal when they’re on the bed, yes — to me, that was a quintessential scene from the book. When Edward gets on his knees, with his mother’s ring, and she says yes — that was one of the most romantic scenes that Stephenie wrote in all four books.

Wyck Godfrey specifically said that if Breaking Dawn was made, it would absolutely be a PG-13 film, so it seems that staying true to that story’s specific events while making it suitable for younger audiences would be challenging.

Well yes, you have to know your audience. And… there’s no reason for it not to be. It could be PG-13.