I've seen it. It's darker than his previous movies (even the hero is a bit of an asshole) and one thing in particular makes it look like a masonic coming out. It's hard to see where the movie is coming while watching it the first time, and some things are unclear and warrant a rewatch.
Miyazaki is going to make movies until he dies. Full stop. His son is not as talented as he is, and I don't see him passing the torch anytime soon.