Since the decision was made to turn The Hobbit into a trilogy was made after initial principle photography has been completed, there is now more to film. According to Martin Freeman it seems the cast will assemble in New Zealand starting in May. No specifics provided on exactly what is being filmed but safe to assume that it will probably involve at least a few scenes for The Desolation of Smaug and lion share probably for There and Back Again. From Hollywood.com:

"I am going back at the end of May for all of June and July. I suppose the thing is, this is not finished. We literally have to go and finish it. It's not a new adventure like on a television show. It's the same story. It's the same gig I started in January 2011. I think it'll be really fun because the crew is quite close and the cast are close and we like working on it. I'm anticipating it."

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