In addition, they report that Warner Bros has announced that the third film will be renamed The Hobbit: There And Back Again.
The second film, to be released on December 13, 2013 will be called The Hobbit: The Desolation of Smaug.
Veronika Kwan Vandenberg, president of International Distribution said in the press release: “The Hobbit: There and Back Again will be an action spectacle and an emotional conclusion for this already much-anticipated trilogy. Opening in the summer will maximize playability for what promises to be an event film for fans the world over.”
EDIT: I think that the second title Desolation of Smaug means that it will conclude with the demise of Smaug at the hands of Bard the Bowman. Highlight to see spoilery speculation.