I'm curious about the legal hoops and hurdles to using Peter Cushing's likeness extensively.
I liked that Krennic didn't have a posh accent like most imperial officers, it kind of spoke to his character's motivation to climb that ladder of success.
Also, Vader's fortress was confirmed by Lucasfilm to be on Mustafar. That definitely adds layers to him, for that to be his "home."
I have to think more about other things before mentioning any, not sure I'm ready to start discussions the spoilers.