It is now only 29 days until Breaking Dawn comes out, and I know there are some Twilight-philes here that I can talk theories with!
What I'm most interested in is the meaning of the prologue (I'll put this in spoilers in case everyone doesn't have the Eclipse special edition).
Okay, so it seems Bella is in a situation were someone she loves is killing her. At first I thought of Edward, but then I thought A) he has enough control over himself that he won't lose his head while changing her, and B) I thought of Bella being a completely out of control newborn, but with 7 Cullens against her, I don't think there'd be any reason to kill her, they could control her well enough.
So then I thought of Jacob. He's seems to be trying to go wolf and leave his human self behind. So I thought, once Bella becomes a vamp, if she and Jacob cross paths, if he's going pure instinct, he's not going to think "Bella", he's going to think "Vampire".