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Peter Jackson had this to say when introducing the first scene from The Hobbit: The Desolation of Smaug.
"It's part of the appendices that J.R.R. Tolkien wrote, and it's part of the expansion of 'The Hobbit' that we're doing. It's not in the actual 'Hobbit' book itself, but it is building on the storyline of the Necromancer and Dol Guldur, which we just talked about. If you remember Galadriel in The Hobbit: An Unexpected Journey, she was commenting on the Morgul-blade that Radagast had recovered from Dol Guldur, and she talks about it belonging to the King of Angmar, who was buried in the High Fells, which are a mountainous range...So in The Hobbit: The Desolation of Smaug, Gandalf goes to the High Fells to investigate how this blade may have got out into the world. The High Fells are the tombs where the nine [Nazgul, a.k.a. Ringwraiths] are buried."
The Hobbit: The Desolation of Smaug comes to theaters December 13th, 2013 and stars Ian McKellen, Martin Freeman, Richard Armitage, Ken Stott, Graham McTavish, William Kircher, James Nesbitt, Stephen Hunter. The film is directed by Peter Jackson.