The Annabelle films are themselves spinoffs based around the demonically possessed Annabelle doll from James Wan’s first Conjuring movie.
The events of Annabelle and Annabelle: Creation take place several years apart, so it would only make sense for Annabelle 3 to explore that as-yet undocumented portion of the Conjuring movie timeline.
Warner Bros. has revealed that the 2019 Conjuring cinematic universe film is the as-yet untitled Annabelle 3.
WB scheduled an untitled Conjuring movie for release in 2019 last week and THR is now confirming that the date will, in fact, go to the third Annabelle movie.