Good news first!!
The moderator at the SKMB has confirmed some info that was already rumored:
There will be two fiction books out next year but Hall Monitor has it right, we're not quite there yet in releasing official info on those other than the titles, which Stephen has mentioned when he was on his book tour for Doctor Sleep. The titles are Mr. Mercedes and Revival.
Unfortunately she added this disappointing news too:
He's taking 2014 off--no book tours. There will be two books out next year--he's already written them--but he won't be doing book tours for them.
Sad, but he's been very busy this year and its understandable.