Don't expect more of the same from “It: Welcome to Derry”. Andrés Muschietti has said the follow-up seasons will push the story into earlier corners of the 20th century and change the show's overall mood.
He also mentioned that most of the central characters will be poorfolk — not the suburban kids from season one — so their problems and reactions will look different (i.e., survival matters more than comfort).
It’s already been revealed that season two will revolve around the Bradley gang massacre in 1935, an incident taken from Stephen King’s 1986 novel "It."
“This will be the era of the Great Depression, which radically changes the setting. There is no suburban comfort... It’s 1935. The situation is very tough. People are very poor. They are struggling to survive, so the atmosphere will be completely different.”
Season three is said to jump ahead to the 1990s, focusing on an explosion at a metallurgical plant during Easter that killed dozens of children. Muschietti added that he and the crew have often debated whether to dig into the clown’s origins — Bob Gray before he became Pennywise — but no final call has been made.
HBO hasn’t shared any release dates yet, so we'll have to wait.