10 Major Predictions For The Fantastic Beasts Sequels
1. We'll Find Out Dumbledore's Sister Was An Obscurus
In the Harry Potter books, Ariana Dumbledore is Dumbledore's younger sister, and we learn some vague but interesting details about her life. At a young age, Ariana is attacked by muggles and traumatised, making it tough for her to control her magical abilities.
As she grows older, Ariana continues to find it difficult to control her powers, resulting at the age of fourteen in a magical explosion which kills her mother. It's at this point that Albus Dumbledore becomes her protector. In the end, Ariana is killed during a duel between Dumbledore and Grindelwald.
Based on what's learned from Fantastic Beasts, the implication is that Ariana forms an Obscurus. Having this confirmed would be another effective way of tying Potter to Beasts, and would throw Ariana's story into a completely new light.