In this weeks UK Sunday Times Magazine, King told Neil Gaiman in an interview that he's in the process of writing a novel called Joyland.
That’s the desk that King sits at every day, and it is where he writes. Right now he’s writing a book called Joyland, about an amusement park serial killer. Below the window is a patch of well-fenced land, with an enormous African spurred tortoise nosing around in it, like a monstrous ambulatory rock.
I posted the whole article here.