Check out the teaser, and the official sypnosis
In the highly anticipated next chapter of the blockbuster The Twilight Saga, the newfound married bliss of Bella Swan (Kristen Stewart) and vampire Edward Cullen (Robert Pattinson) is cut short when a series of betrayals and misfortunes threatens to destroy their world. After their wedding, Bella and Edward travel to Rio de Janeiro for their honeymoon, where they finally give in to their passions. Bella soon discovers she is pregnant, and during a nearly fatal childbirth, Edward finally fulfills her wish to become immortal. But the arrival of their remarkable daughter, Renesmee, sets in motion a perilous chain of events that pits the Cullens and their allies against the Volturi, the fearsome council of vampire leaders, setting the stage for an all-out battle. The suspenseful and deeply romantic Breaking Dawn continues the epic tale of supernatural fantasy and passionate love that has made The Twilight Saga a worldwide phenomenon. Currently in Production. U.S. release via Summit Entertainment, November 18, 2011, and November 16, 2012.