Alex Kurtzman while speaking with Fandom also suggested in their interview that classic and non-classic monsters will be considered for the Dark Universe, even international ones.
“There are characters within those films that can grow and expand and maybe even spin off. 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.”
I’d assume that we’ll see Jack The Ripper as well as Universal has tackled him with Hands of The Ripper (1971), unless Russell Crowe’s Mr. Hyde takes that mantle. Other horror material outside of the classics including aliens with The Thing (1951, 1982, 2011)/This Island Earth (1955), zombies with Dawn of The Dead, ghosts with Crimson Peak/The Frighteners/Ghost Story, and demons with Tales From The Crypt: Demon Night/Prince of Darkness.