OK, not out yet with no release date, same as Peace Talks, no release date either. I did find on Reddit a reference to his website and to see it click here and get your updates for these much-awaited books. As of December 27th, 2018, he is on chapter 39 in Peace Talks, the 16th book in the Harry Dresden Series and will start on Book 2 in the Cinder Spire series call The Olympian Affair.
Jm also left us with a Christmas Story called Christmas Eve, which takes place between Changes and Cold Days. No grading system required since it is a very short story. Go to the link to his page for the short story.