Supposedly he's working the idea out in his head and will not start
writing it or even outlining it for at least another 8 months.
The working title for this new Dark Tower book, is either "Wind
through the keyhole" or "The wind through the keyhole". Many speculate
it would take place between the battle of Jericho hill and the events
of "The Gunslinger". I personally hope it adds an entirely new twist
to the Dark Tower saga.