The Berkley Publishing Group's May 2008 catalog lists 'Batman: Gotham Knight' as going on sale April 29th, 2008. Comics scribe Louise Simonson is writing the book, based on the anime prequel to 'The Dark Knight'. Here's the plot description:
After Wayne Manor is burned to the ground, Bruce Wayne establishes a new base of operations, and — as Batman — refines his personal vigilante mission, encountering foes both old and new.
Set in the time period between 2006’s movie 'Batman Begins' and the new film, 'The Dark Knight', starring Christian Bale as Batman and Heath Ledger as The Joker.
The book will sell for $6.99. ISBN number is 978-0-441-01613-6