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Annabelle 3 confirmed with first plot details
It's not a prequel (but it is a prequel).
Improving on Annabelle wasn't difficult, but Annabelle: Creation took the greater step of improving it, as well as improving on it. In the original, the doll belonged to a girl in a cult who killed herself holding the doll. The prequel revealed a deeper, darker backstory to the doll, one that makes the world of Annabelle that much richer.
Evil little doll Annabelle is no doubt the MVP of The Conjuring cinematic universe, and now she's getting her third solo movie, which is one more than the main Conjuring series has at this point.
As revealed at the ScareDiego event at San Diego Comic-Con, the currently untitled third Annabelle movie will be a sequel to the first spin-off movie, rather than a prequel like Annabelle: Creation
Annabelle 3 confirmed with first plot details