In an unprecedented move for an actor under contract with Marvel Studios, star Kathryn Hahn refused to reveal any information about the upcoming WandaVision spinoff, Agatha: Coven of Chaos. While promoting her new film Glass Onion: A Knives Out Mystery, Hahn broke the silence around the mysterious upcoming project by talking about absolutely nothing, bucking a long-standing trend of Marvel Studios’ actors spilling the entire plot of their projects during interviews.
When asked by Kimmel if Hahn knew anything about Agatha: Coven of Chaos, which is expected to introduce Billy Kaplan, aka Wiccan, to the MCU when it streams on Disney Plus in late 2023 or early 2024, the actress responded by saying, “I know everything about it.” Hahn then went on to divulge absolutely nothing about the series.
Though Hahn shockingly refused to let the cat out of the bag, she did reveal that the spinoff was not something that was planned ahead of the release of WandaVision, telling Kimmel that she “did not know I was going to be doing it [Coven of Chaos]” when filming on WandaVision was underway. Given the information from Hahn, it seems as though Agatha: Coven of Chaos was green-lit as a response to her stellar performance in WandaVision. According to Hahn, she was as surprised and excited as anyone to find out she’d get to come back as Agatha in her own series.
I guess nobody really knew that a centuries-old witch was gonna have any sort of long shelf life. So everybody was very, myself included, mostly, I would say was the most excited to know that there’s going to be another show happening.Kathryn Hahn
Given where Hahn’s character’s arc left off in WandaVision, it seemed clear that the character would return in the future but the idea that the studio had no concrete plans at the time is interesting. The Agatha-centric spinoff was announced to be in the works just about 7 months after WandaVision completed its run on Disney Plus and about 4.5 months after Jac Schaeffer, who was the head writer on WandaVision and is writing Agatha: Coven of Chaos, signed her 3-year deal with Marvel Studios. The evidence would seem to suggest that Schaeffer likely pitched the show and has been the driving force behind it.
Source: Jimmy Kimmel Live