Pottermore has announced this afternoon that Jude Law will be taking on the role of Young Dumbledore in the next Fantastic Beasts and Where to Find Them film. The sequel to Fantastic Beasts is slated for release 16 November 2018, and filming begins this summer.  Three more films will follow after this sequel. According to the article:

The second film in the Fantastic Beasts series will show Dumbledore decades before he became Headmaster at Hogwarts School of Witchcraft and Wizardry.

At this point in the story he is the wizarding school’s Transfiguration professor and a contemporary of Gellert Grindelwald – the Dark wizard we met in Fantastic Beasts and Where to Find Them, played by Johnny Depp.

On the announcement Potter and Fantastic Beasts director David Yates said: “Jude Law is a phenomenally talented actor whose work I’ve long admired and I’m looking forward to finally having the opportunity to work with him. I know he will brilliantly capture all the unexpected facets of Albus Dumbledore as J.K. Rowling reveals this very different time in his life.”

The article also gives a tiny bit of information regarding the plot of this second film, which “takes the story deeper into an increasingly dark time for the wizarding world, where Newt and our other heroes must decide on their allegiances.”