Buena Vista Pictures has officially announced the subtitle of the National Treasure sequel.

It will be called National Treasure: The Book of Secrets. The subtitle refers to the 18 pages which are actually missing from John Wilkes Booth's library; it will also possibly involve Abraham Lincoln.

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Jon Turteltaub directs and Jerry Bruckheimer executive produces again. The Book of Secrets is expected to star Nicolas Cage, Justin Bartha, Diane Kruger, Jon Voight and Harvey Keitel; a December 21, 2007 release is scheduled.

Dont't forget to also check out: National Treasure: Book of Secrets