In case JK Rowling has a hand cramp, I’m willing to take a stab. I’ve made some notes.
The next book is going to be wildly different. Nobody goes back to Hogwarts. Instead they buy a van, paint it and call it the Magic Machine…Harry Hermoine, Ron, Ginny, Hagrid and their dog, Scooby Doo.
Sure, there’s an extra human. Ron can be Don Knotts.