MTV has an interview with director Catherine Hardwicke, including this juicy piece of news:

“MTV: Very cool. And will it be a two-disc or a three-disc?

Hardwicke: I think there’s gonna be a two-disc and a three-disc. A one, two and three! I’ve also got all the cool storyboards and drawings and sketches and stuff, so we’ll probably get all that stuff out there.”