Because everything with even a modest amount of success has to be (at least) a trilogy now, Pitch Perfect 3 is in the works, says The Hollywood Reporter

Kay Cannon, who wrote the first two movies, is reportedly in negotiations with Universal to pen the third script. Hailee Steinfeld, who was added to the franchise for the second movie, reportedly has a third film in her contract, but other than that its unclear who would be coming back for part 3. 

Anna Kendrick and Rebel Wilson aren't locked into contracts for a third movie, and considering that the first sequel was a massive success (it has already made more than $190 million on a $29 million budget) they're probably going to require a big raise if they're going to be enticed into returning. Wilson, for her part, was rumored to have already agreed to part 3 back in April. 

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