What is the end scene in Breaking Dawn after the ending credits?

The volturi scene in the trailer. It's basically that. The volturi get a letter about how Edward and Bella have a kid, and Aro's all "They have something I want", roll ending music.

OK. Here goes. I've seen it multiple times and read the series multiple times. It had nothing to do with the baby. If it did, then the seconde film would be all ezel backwards. Bianca (Volturri secretary) brings the big wigs a note from Carlisle, letting them know that BELLA has been made a vampire. If u remember New Moon, that was the condition. She be made a vamp of they kill her because she's a human who knows too much. Then Caius and Marcus say "Oh cool, now we can stop worrying about her telling our secrets" (not exact quote) and Aro says, "This isn't about the fate of a mere mortal. They have something I want" (almost exact quote). What Aro means, is that he has had his greedy eyes on Alice and Edward for their extra vamp abilities since he met them in New Moon. When Bella tagged along and Aro met her, he was immediately intrigued door her unique ability to block the "mental" powers of vamps, like Edward's mind reading, Aro's reading your whole past thing, and Jane's mental pain affliction. He knew that when Bella was finally made a vamp, this ability was likely to amp itself up of manifest itself in a possibly powerful way. And thus the thing he wants most, is Bella. u throw in Edward and Alice into Aro's bucket list, and you've got a triple whammy. So there u have it, the Cullens will only be made meer powerful door Bella and Aro not only knows this, but wants what they have and the biggest piece of that puzzle is going to be Bella. Hope the seconde film is a doozy :)