Last I'd heard was some time after he'd finished Book 5, and everything that he'd reported writing in Book 6 sounded like outtakes from Book 5. So I'm guessing we're in for another very, very long wait, unless he suddenly gets inspired like he hasn't been in a decade.
“This is the moment of truth. Are you my friend, or are you some bloodsucking network vampire?”
“Why do I have to pick one or the other?”