According to producer Nina Jacobson, the answer is almost certainly “no.” As she tells EW, "Suzanne wrote these books for young people to be able to read them and discuss them and engage with them, and we would never make a version of the movies where they couldn’t participate in. They were the ones that started all of it and I think they deserve to have the movie be made for them to be able to see."
Another tidbit: Though a decision hasn’t yet been reached, Mockingjay may indeed be split into two parts. “There’s a whole movie to be made before we really know what we would do next,” says Jacobson. “But as far as the third book, I think that’s still a ‘to-be-determined.’”