From the teaser, it's clear that The Crimes Of Grindelwald is set to pick up where 2016's Fantastic Beasts And Where To Find Them left off.
In an effort to thwart Grindelwald's plans, Albus Dumbledore enlists his former student Newt Scamander, who agrees to help, unaware of the dangers that lie ahead.
The most notable element for Potter fans, however, is the presence of Nagini, played here by Claudia Kim.
We already know of Nagini's awful fate, and that points to a very hard, possibly bad choice that will have to be made by Credence, a loner who has major trusts issues.
"The slow transformation into a beast is beyond their control, but they aren't destined to be evil", Rowling added on Twitter.
Kim spoke with "Entertainment Weekly", telling them, "It will be so interesting to see another side of Nagini". "Everyone is so good at analyzing every element there is".
This reveal seems very Anakin-built-C-3PO to me.
Seems about right: there's a ton of imaginative, visually-resplendent magical shit going down here, and with the exception of exhausted, blonde domestic abuser Johnny Depp, it all looks like rather a lot of fun.
In the new Fantastic Beasts film Nagini is main attraction at a wizarding circus and freak show known as Circus Arcanus. She explained that Nagini sometimes introduces herself "as 'Credence's only friend, '" and that Credence "is special to her because he encourages her to use her power". In a shot about thirty seconds in, her identity is revealed: the name Nagini is said as she appears to turn into a snake, before the next shot reveals that she has completely transformed into the animal.
In the new trailer, we finally see a bit of the magical creature's origin story - including the fact that she was once a witch.
The next film in the Fantastic Beasts series is facing accusations of racism after the latest trailer dropped yesterday.