That's what I heard as well, making excellent marketing sense. Who knows, maybe we'll see Christopher Lee in it (since he wound up on the cutting room floor in the theatrical release)!!!
Yes: He was trapped in the tower at the start of the third film, but you never saw him then or heard about him for the rest of the film. In the book, I recall he escapes from the tower and goes to the Shire, and the Hobbitts have to return to get him out of there. Maybe some of that makes the director's cut.
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