According to Daily Blam:
A source at the Louisiana Film Commission has revealed which scene from the anticipated final installment of the Twilight movie franchise will be filming very near to the Baton Rouge area.
Recently, Summit Entertainment, the studio behind the highly lucrative film series The Twilight Saga, announced that filming for the franchise's final chapter, Breaking Dawn, will partially take place in New Orleans and Baton Rouge, Louisiana. A source within the Louisiana Film Commission has disclosed to me that members of the Breaking Dawn production crew have already scouted out the location they are planning to use for the film; which the studio is releasing in two parts.
The scene will be the final confrontation between the Cullen clan, who are joined by the Quileute wolf pack and their friends, and the Volturi. The scene, most of which is taken directly from the novel, has been extended to include several physical fights. It is expected that many Twilight fans will be flocking to Louisiana when the studio begins filming in the area; which is why the exact area the production team has decided on is being kept tightly under wrap.