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.

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