Of course, The Crimes of Grindelwald isn’t exactly focused on the beasts themselves, but on the Wizarding War against Johnny Depp’s Gellert Grindelwald.
This bit of information, while still a mystery, just shows how far the Fantastic Beasts franchise is looking ahead.
It was announced fairly early that there’d be a whopping five movies to present a longer story, so it was clear that Newt Scamander and his magical creatures were here to stay.