Ever since New Line announced that King's epic 1986 novel would be split into two parts, it has been obvious to most people, including director Andy Muschietti, that Chastain would be flawless to play the grown-up Bev, who returns to the town of Derry with her fellow Losers almost 27 years later to face the evil, shapeless presence they defeated as children.
Variety goes on to stress that negotiations are still underway and that the IT: Chapter 2 script is not yet finished, but for now it appears safe to assume that Chastain will appear in the film (worth noting: while this might not be the most terribly exciting scoop you've ever heard, it is a strong bit of casting and we're all for it).
Even Chastain herself has expressed that she'd love to do it, as she told ScreenRant a year ago, "Well, I love Andy and [producer] Barbara [Muschietti]". The red-haired beauty has worked with Muschietti and producer Barbara Muschietti on 2013's horror film "Mama", which has become his first studio hit. Given her previous work with helmer Andy Muschietti, it isn't exactly a huge surprise that she's in talks (Muschietti even said she was his top choice), but it's an incredibly welcome one, as Chastain is an fantastic talent. His first film. And you know, Barbara is one of my best friends so... "Anything that they're doing, I want to be a part of, so I hope we can make it happen". They're like my family. In the book, a group of kids known as the Losers' Club battle an inhuman shapeshifting monster that feeds on children.
Bill Skarsgard, however, is set to reprise his role as the evil clown, Pennywise, for the sequel.
In King's novel, adult Bev is a successful fashion designer in an abusive marriage.
The It sequel already has a September 6, 2019 release date staked out.