Diane Haithman is contributing to Deadline‘s TV coverage.

UPDATED: Three more American Horror cast members from Season 1, regular Evan Peters and recurring Sarah Paulson and Lily Rabe, will return for the anthology series’ second season as regulars. They will join Jessica Lange and Zachary Quinto, all playing new characters in a new setting at a East Coast institution. AHS co-creator/executive producer Ryan Murphy made the announcement during the show’s PaleyFest panel, held at the packed Saban Theatre in Beverly Hills. “We don’t want to talk about it too much, we’re still writing, anybody could pop up at any time,” he said. He didn’t want to elaborate on the returning actors’ new characters, saying only that “everyone is playing the opposite of what they played before.” As for the second season as a whole, “The only real rule on this show is no werewolves and no vampires,” Murphy quipped.

Joining him on the large panel were AHS co-creator/executive producer Brad Falchuk, executive producer Dante Di Loreto and actors Alexandra Breckinridge, Frances Conroy, Paulson, Lange, Dylan McDermott and Connie Britton. The creative team and the actors spent the evening joking about the over-the-top violence, nudity (especially McDermott’s posterior) and kinky sex of the first season while remaining mum about plot details for Season 2. Falchuk did confirm that the team would maintain its commitment to make show an anthology, with a new story each season and “a new group of people to fuck with.”

Murphy and Falchuk, also co-creators/executive producers of Fox’s Glee, both said that, while producing the two series simultaneously presents a challenge, it is a relief to bounce back to the cheerful musical show when American Horror Story gets too dark. “It’s wonderful, really,” said Murphy. “This is a very heavy show.” But for everyone. “The Glee kids were obsessed with American Horror Story – more obsessed than they were with the next Glee script,” Murphy said. Both series are filmed at Paramount. Filming of second season of AHS begins in July.