The Conjuring 2 is already in development before The Conjuring is released.
New Line president Toby Emmerich has revealed that a sequel is already in development, and claims that The Conjuring is ”as good a horror movie as we’ve ever made.” With Lorraine Warren’s “permission and support,” the studio is already moving ahead with the sequel, while the first film is still not in theaters as of yet.
The Conjuring is estimated to make $30 Million dollars for this opening weekend, which I believe will make way more then that. With its budget at $13 Million, it makes sense to make a sequel.
Chad and Carey Hayes, the screenwriters behind The Conjuring have already signed on to pen a script for The Conjuring 2
Report from Variety