Rowling has been criticised in the past for the lack of diversity in her Harry Potter books and one fan accused her of the casting of Nagini as an Asian woman as an afterthought to try and increase representation.
However, in the preview that debuted Tuesday, there is a sequence in which Credence (Ezra Miller) whispers the name "Nagini" before Kim's character transforms into a snake inside what appears to be a circus cage.
Warning: There are spoilers ahead for Fantastic Beasts: Crimes of Grindelwald in this article. As it turns out, Kim's character is none other than Nagini, who fans will remember as Voldemort's snake and secret horcrux.
When a fan asked Rowling on Twitter exactly how long she has known about Nagini's past, she replied saying, "Only about 20 years". Kim was able to break her silence about her character thanks to this new trailer and shared some more details in an interview with EW.
The screenplay of Fantastic Beasts: Crimes of Grindelwald was written by Rowling, who is also a producer on the film.
Given Kim's description of Nagini as "wonderful", it will be interesting to see how the character goes from that description to Voldemort's No. 1 killing machine - remember, Nagini was the one who killed Severus Snape in the Battle of Hogwarts. "I'm sure she will bring humanity, dignity and vulnerability to Nagini".
"They are sometimes depicted as winged, sometimes as half-human, half-snake", she said. If you wanted to cut a trailer to appeal to the hardcore Harry Potter fans, this would be it. But it must also be noted that the Fantastic Beasts 2 final trailer eventually resulted in the film coming under fire for casting an Asian actress for the Nagini role.
The nearly two and a half minute trailer promises action, surprises, wondrous visual effects, a strong Dumbledore/Newt bond, and a terrifyingly motivated villain in Johnny Depp's Grindelwald.
The movie follows Newt Scamander (Eddie Redmayne) and his fight against Gellert Grindelwald (Johnny Depp), a dark wizard, in a pre-Harry Potter world. You can see the trailer that kicked off all this chaos below.
'Fantastic Beasts: The Crimes of Grindelwald' will hit United Kingdom cinemas on 16 November.