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Another spinoff from the Conjuring franchise is in development, this time focused on the demonic nun from the sequel. Sequel co-writer David Leslie Johnson returns to script, while director James Wan will only be producing (much like he did with the Annabelle spinoff). Not much else is known about the project since it's still really early in development.
http://www.upcominghorrormovies.com/movie/nun
What's ironic is the demonic nun in Conjuring 2 was a last minute decision by director James Wan. Originally the antagonist was going to be some sort of demonic figure with horns, but Wan apparently had a revelation and brought his nun idea to the studio. After the studio approved it additional filming occured just a few months before the movie's June release. There were other digital alterations to reflect the change.
I'm happy with what was shown in the sequel, this spinoff might actually be too much, much like with Annabelle. The doll was creepy in the first movie, but wasn't all that great in its own film.