Pixar has no plans for sequels beyond The Incredibles 2
In an interview with EW, Pixar president Jim Morris said that the studio plans to create more original content instead of developing sequels. He said that "everything after Toy Story and The Incredibles is an original right now."
Other sequels in the works include Cars 3, which will be released in June 2017, and Toy Story 4, which will be released in 2018.