Rowling's first adult offering, a dark comedy titled The Casual Vacancy, is due to be published in the UK and US this September.

FORBES: JK Rowling

K. Rowling went in a new direction with "The Casual Vacancy, " an adult-literary novel that Little, Brown published last fall.

WSJ: How to Kill a Vampire (Series)

"The Casual Vacancy" is under a strict embargo until its release.

CNN: Muggle moms await first adult J.K. Rowling book

It sounds like a good book, and it will certainly sell well, but The Casual Vacancy is not the stuff of entertainment franchises.

FORBES: Muggle-Ware: Will The iPad Mini Be Apple's First Non-Magical Product?