King gave us some very interesting news yesterday at the reading in Washington, D.C. about the third book about Jack Sawyer. King confirmed that it was supposed to be a trilogy and that he had already worked out the framework for the third book in his head. He also said he hoped to write it with Peter Straub during next year.
After reading this I emailed Peter who confirmed that the plan is to write the book next year. So, very good news for all fans of The Talisman and Black House!