Finished Final Fantasy XIII already and want more? You might get more in the future. Yoshinori Kitase spoke about the possibilities of Final Fantasy XIII getting a sequel similar to how Final Fantasy X got a sequel with Final Fantasy X-2.
“In the past three years we worked both on the world and on the various systems. Creating these systems isn’t very glamorous and can frankly be a bit boring. If we could do a XIII-2, we could direct all our attention to the story and refine what we have already built.”
The possibility of a Final Fantasy XIII-2 is dependent on how well Final Fantasy XIII does in the west. If you are desperate enough, you could always go buy a second copy.
He was also asked a bout the possibility of a Final Fantasy XV and said that also depends on how well Final Fantasy XIII does in the west. I don’t think many people doubt that there will eventually be a Final Fantasy XV. But if you are concerned, there you go.