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  (Photo: AP Images / Scholastic, Matt Sayles)
  J.K. Rowling speaks at a press conference at the first stop of the J.K. Rowling Open Book Tour at the Kodak Theatre in Los Angeles on Monday, Oct. 15, 2007. Ms. Rowling will be reading from Harry Potter and the Deathly Hallows, answering questions and signing books for 1,600 students from the Los Angeles Unified School District.

One day before releasing a new book for adults, J.K. Rowling has admitted that there could be more "Harry Potter" books in the future.

Although the 47-year-old has moved away from children's books with "The Casual Vacancy" recently, Rowling said if she stumbles upon "a fabulous idea" soon, there could be another "Harry Potter" book.

"Harry Potter truly liberated me in the sense that there's only one reason to write, for me- if I genuinely have something I want to say, and I want to publish it," the author explained to BBC. "Now if I had a fabulous idea that came out of that world- because I loved writing it- I'd do it."

Her latest book, however, is nothing like "Harry Potter."

"The Casual Vacancy" is Rowling's highly anticipated first novel for adults and is already number one on Amazon. It has been rumored to include references to sex and drugs- a far cry from her wildly successful "Harry Potter" books about a young boy who realizes he is a wizard.

The book will hit stands on Thursday. It is being held under tight control, with media outlets required to sign non-disclosure agreements ahead of receiving a copy, according to the Associated Press.

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In another hint that there could be more to the "Harry Potter" series, Rowling explained that writing "The Casual Vacancy" took longer than expected because of her famous character, Harry.

"I've been writing other things during that time, but on and off for five years, that's been my priority," said Rowling in an interview with "Nightline."

"I think I've been surprised by the fact that Harry hasn't left me to the degree that I thought he would. And I'm quite glad about that," she revealed.

The 7-book series of "Harry Potter" has been published in 73 languages and has sold over 450 million copies, in addition to spawning film spin-offs. The books made Rowling the first author to become a billionaire.