Fantastic Beasts and Where to Find Them - 2016 November

1. The possession of the Elder Wand
From what we know in the 7th Harry Potter book, Grindelwald had stolen the Elder Wand when he was a young man, but the Grindelwald in this movie is approximately in his 40s. Exactly when Grindelwald had stolen the Elder Wand, the year isn't dated, but it must be before he started terrorizing Europe. But then near the end of this movie, Tina took his wand. As the wand itself looks nothing like the Elder Wand, it's highly likely Grindelwald had been using other wands in disguise. Yet if wands are taken, the right to possess the wand is also taken. So, does this mean Tina was a temporary master of the Elder Wand? There are 4 more movies to come, so I guess Grindelwald winning back the possession would be likely.

2. Ariana Dumbledore
Grindelwald expressed grief and frustration over children having to restrain their magic, eventually dying from Obscurus. Could it possibly be that Ariana Dumbledore had been a host of Obscurus? Aberforth says that muggle kids had bullied her into insanity, but there's a chance that restraining her in the house for long periods of time actually made it worse.

3. Modesty
Witch, or not? Grindelwald mistook Credence for a Squib, but I doubt he'd mistake a muggle for a witch restraining her powers. Then again, Credence's power was let loose at the time, so she probably was just within range of magical influence.