Stephenie Meyer’s site have been updated with Breaking Dawn FAQ’s, check it out here.
What does the cover mean?
Breaking Dawn’s cover is a metaphor for Bella’s progression throughout the entire saga. She began as the weakest (at least physically, when compared to vampires and werewolves) player on the board: the pawn. She ended as the strongest: the queen. In the end, it’s Bella that brings about the win for the Cullens.
(I called it! haha =] )