There is a lot of articles being posted on the internet about the fans of American Horror Story wanting Vera to join the cast and there is rumors of it becoming true. I would find this amazing if it did happen but time will tell!
As for American Horror Story Season 6, it doesn’t seem likely that Vera Farmiga could appear on the show, unless it’s in a small role, as she’s currently working on the final season of Bates Motel. As many fans of the actress know, Vera’s character on the series was recently killed off, but will still have a very big part on the show. However, fans can’t help but wonder if the actress would be open to appearing on future seasons of AHS.