Here is what is known from various Potter sites.
- There will be five Fantastic Beasts movies
- The second one will be set in Paris, France
- Dumbledore and the dark wizard Grindelwald will play major roles
Grindelwald was the Voldemort of his day. It led up to a World Wizarding War that ended in 1945 with a duel between him and Dumbledore. The link below covers their history very well.
I suspect the five movies will go all over the world and introduce how wizards live around the world and the major schools they attend. Rowling has already provided backgrounds on the wizarding continents and the major schools on Pottermore.
Is FANTASTIC BEASTS Leading to the Famous Dumbledore/Grindelwald Duel? | Nerdist