The story is set in 1920s New York - decades before Harry Potter is born.
It is still based on the Harry Potter novels by Rowling and is adapted for the big screen from her textbook of the same name.
Fantastic Beasts focuses on wizard writer Newt Scamander (Eddie Redmayne), who has been expelled from Hogwarts and is seeking a new adventure.
The movie follows Scamander as he explores the hidden wizarding world of the United States.
Hogwarts teacher, Albus Dumbledore, gets a mention in the trailer and the film, which also stars Colin Farrell.
Meanwhile, more about another upcoming Harry Potter spinoff.
Yesterday she tweeted a picture showing wand designs for the new London play Harry Potter and the Cursed Child.
Alongside the photo, she said: "Exciting morning at rehearsals for #CursedChild. What do you think of our wand designs? #HarryPotterPlay..."
The Cursed Child stage show is a sequel to her famous book series and opens on July 30 at the Palace Theatre. Fantastic Beasts and Where to Find them is expected to be released in cinemas in November.
- nzherald.co.nz