The Harry Potter author has a deal with Little, Brown in the United States and Britain to publish her first novel for adults. Her last book was Harry Potter and the Deathly Hallows, the series finale, in 2007. (The Potter books were published by Bloomsbury in Britain and Scholastic in the U.S.) In the press release, Rowling writes:
Although I’ve enjoyed writing it every bit as much, my next book will be very different to the Harry Potter series, which has been published so brilliantly by Bloomsbury and my other publishers around the world. The freedom to explore new territory is a gift that Harry’s success has brought me, and with that new territory it seemed a logical progression to have a new publisher. I am delighted to have a second publishing home in Little, Brown, and a publishing team that will be a great partner in this new phase of my writing life.
Further details about the book were not released.
Update: Some news from Rowling’s Twitter account: It’s coming out later this year.
As you may have heard, I have a new book out later this year.Very different to Harry, although I’ve enjoyed writing it every bit as much.
— J K Rowling (@jk_rowling) February 24, 2012