John replied to tweets about The Conjuring and Stranger Things; to the Conjuring he said it’s perfect for HHN and that the Crooked Man would be a stilt walker, and that for ST he’s checking it out. Most likely were getting these two for 2018
If he's saying he'll check out Stranger Things and how he'd do Crooked Man for Conjuring at HHN, it's very likely he'll either stay as creative director for one more year OR stay on as a consultant to help pass the torch to his successor next year..