From Fandom. Mummy director/producer Alex Kurtzman had this to say about upcoming plans for the Dark Universe
We know we're going to do Frankenstein, Bride of Frankenstein, Dracula, Creature from the Black Lagoon, Phantom of the Opera, Hunchback of Notre Dame, Invisible Man," explained Kurtzman, naming Phantom of the Opera and The Hunchback of Notre Dame as future projects in the line for the first time. But that's not all he gave away; he also teased additional spinoffs featuring unnamed supporting characters from those stories.
There are characters within those films that can grow and expand and maybe even spin off," said Kurtzman, adding, "I think that digging into deep mythologies about monsters around the world is fair game for us, as well and connecting the monsters that we know to some surprising monsters could also be really interesting."