The Harry Potter franchise has always been a pro-LGBTQ series, with fans shipping (i.e. romantically pairing) same-sex characters and JK Rowling herself being a big gay ally. But it wasn't until Fantastic Beasts: The Crimes of Grindelwald came out that we truly got to see a queer moment in the franchise.
Dumbledore is openly gay in this movie, and his relationship with Grindelwald is incredibly interesting. The two of them have an almost platonic relationship that feels more like a bromance than anything else, and it's a refreshing counter to the usual depictions of male-male relationships in the series.
While Dumbledore's sexuality has been canon since 2007, and Rowling herself has been clear that he is gay, this new film is the first time we've seen him exhibit homosexual attraction to another man. And that's what makes this movie so exciting.
The only problem with this is that the rest of the movie is just so cis-centric. As the main character in the series, Harry gets to be a part of some pretty great female friendships, but the movies have trouble passing the Bechdel test when it comes to the number of women who get to speak.
So it's hard to believe that, even after this new film, there aren't going to be a lot of queer representations in the Potterverse moving forward. Especially when it's hard to see a lot of representation in the real world, where LGBTQ people are so marginalized and murdered.