Off the top of my head, I think that I may have seen two Harry Potter movies, though the only one I remember is Harry Potter and the Prisoner of Azkaban (mainly because it was directed by Alfonso Cuarón, who did the remarkable Children of Men–one of those rare movies significantly better than the books that inspired them–more so than actually caring anything about the characters).
So, when I learned that Warner Bros was revisiting the well, in my head I didn’t hear ‘New Harry Potter movie!’ more than ‘Studio Desperate for Hit Revisits Profitable Franchise!’
Though to be fair, having seen Batman v Superman: Dawn of Justice I’m shocked that they didn’t announce a new Matrix movie as well.
And speaking of Batman v Superman, Fantastic Beasts is is apparently coming out the same month, November, as Marvel Studios’ Doctor Strange–also starring a preeminent British actor with a storyline that revolves around magic and things that definitely go bump in the night–though I get the feeling that the audience for the two movies is different enough that both should prosper (with a YUGE caveat: I am not sure who Fantastic Beasts and Where To Find Them is aimed at. Former children weaned on Harry Potter books and movies? It’s possible but the bulk of them probably aren’t that old. Nostalgia? I have no idea).