Matt Donnelly of the LA Times interviewed Melissa Rosenberg about the script for Breaking Dawn I and II.  Here is a portion of what she had to say in that interview. 
Of note, pre-production begins July 1.  Also, Stephenie Meyer supports her bringing invention into the storyline. 
Remember my question about how you feel about them going “off book”? 
And maybe the birth scene will be “fade to black”?  That portion she is leaving up to Bill Condon though! (Click here for that interview.)

Melissa Rosenberg: It’s going really well — it’s a very big challenge. It’s just thick with mythology and characters and choosing which stories to bring forward. It’s a beast, but I think it’s going well.

MoG: Stephenie Meyer has been consulting on the films from the start. Given this is the final chapter, what are her major priorities for the fans?

MR: She has always only demanded one thing, and that is that we adapt the book. All of her really big boundaries have to do with just adapting the book. That said, she isn’t terribly precious about things. She’s supportive of my bringing invention to it.

MoG: Speaking of which, [spoiler alert!] fans are crazy over Bella losing her virginity, the graphic birth of her and Edward’s child, and her vampire transformation. Any idea how you’ll handle such serious imagery?

MR: On the fan site, on Facebook, all the comments are “It has to be R rated! You have to show the childbirth! Gore and guts and sex!” For me it’s actually more interesting to not see it. You know, you can do childbirth without seeing childbirth … it doesn’t mean it’s any less evocative of an experience.

MoG: Kristen Stewart arguably has the most work to do in the final films. Is she up to the challenge?

MR: Kristen Stewart is really, I think, tremendous. And one of the reasons why we got Bill Condon. And Chris Weitz, for that matter; they all want to work with her.

MoG: A lot of the fans credit you with giving Bella more backbone in the films than she has in the books. Was that something you did actively?

MR: That’s something I did very consciously. What’s interesting is that it’s all there — the strength was there, it was just kind of tearing away some things. You know, she’s human. She doesn’t have the physical strength of Edward and all of them. So how do you make the character strong when she’s physically vulnerable? There really is a goal to give her stamina and other strengths. She really is a role model.

MoG: Your prior credits ["Dexter," "Ally McBeal"] definitely incorporate strong females. Is that a place you’ll return to after “Twilight” is done?

MR: Absolutely. What I really want to do is create great roles for women. And I’m not talking Nicholas Sparks romance. I think women’s roles have gotten ghettoized in these sort of places. … I’m thinking women in action, comic books, or like the Tony Soprano of women. We need some complex roles.

MoG: Back to “Twilight”; this franchise has dozens of characters. Anyone in particular you love writing for?

MR: I love Charlie, Billy Burke’s character [Bella's father]. Writing for him is so spectacular, he’s so funny and wry and every scene he’s in he just takes. There’s a scene in “Eclipse” where Bella tells him she’s a virgin, and it’s the funniest, most awkward scene I’ve ever seen on film.

Rosenberg says pre-production will begin July 1, with both films slated to film back to back at the start of October.

Related posts:

1. Twilight Screenwriter Melissa Rosenberg on Breaking Dawn Adaptation
2. ‘Breaking Dawn’ Script: Melissa Rosenberg Says Battle Scene Is ‘Enormous Challenge’
3. Rosenberg Says Birth Scene in Breaking Dawn Up To Bill Condon
4. Melissa Rosenberg on Breaking Dawn and Directors
5. ‘Breaking Dawn’ Writer Says She’s Trying To ‘Find Room’ For All Characters

Hum…don’t…know….what…to say….I mean she’s saying that THE most important scenes are up to Bill about how far they will take it visually, and then in the same breath, she is saying that in her opinion…she doesn’t need to see the honeymoon/birth scene ramped up a notch to what the fans want…SO………..which is it!? Her way, our way, or Bill’s?!

Well at least she knows we want an R! LOL…even though it prob. wont happen.

I love Charlie too! he is also one of my favorites! so funny..especially in twiight with the gun! till today i still laugh when i remember that scene! Oh and i am so looking for that scene in Eclipse..where they have the awkward sex talk…one of my favorites in Eclipse!

I think that strength or Backbone comes also with the fact that its Kristen Stewart playing Bella…Kristen brings the strong more independent Bella out…i think, kinda like that!

and more interesting to not see it?? for me, i dont really want to see the birth scene..i still shriek remembering it…we just want a great passionate, steamy and emotional isle esme even if we dont see too much *wink wink* LOL haha. After all, isnt it what twilight is about? passion, innocence..first time and first love…

“She’s supportive of my bringing invention to it.” This explains a whole lot! SM is approving so this is why everything is passing…after all, she has to approve it before anyting happens..so there we go!

Didn’t mean to make it sound like I wanted to see a graphic birth scene, b/c that is so not what I want. That scene, they can do however they wish. I just meant the Isle Esme/honeymoon….that first night w/ all the feathers and then where they end up breaking the headboard later on……can we please, just that?

BUT, it’s true…SM is approving of MR added invention…and that she most definitely has done! So goodness knows WHERE MR is going to go w/ BD. She seems a little weird, anyone else get that?

Oh, and Trish I LOVE that scene from Twilight w/ Charlie and the gun! And then Bella is all like “Dad…could you be nice? He’s important.” And Charlie makes a halo around his head!! SOOOOOOO funny, I laugh out loud every time!

Yeah…Kristen deos bring that sense of independence to Bella. I can see that.