http://www.square-enix.com/na/company/press/2006/0508_1/
To celebrate the 13th title in the world-renowned FINAL FANTASY series, Square Enix has undertaken a colossal project involving the development of various content for multiple platforms. FABULA NOVA CRYSTALLIS, defined in Latin as "the new tale of the crystal," is made up of several different titles based on variations of the FINAL FANTASY XIII universe. However, while each title in the project features
different characters, different worlds, and different stories, all are ultimately based on and expand upon a common mythos.
FINAL FANTASY Versus XIII for PlayStation 3 system
Harmony is realized in this alternate tale of FINAL FANTASY XIII
Not a merely a sequel, but a
wholly independent story unfolding in a different world with different characters. This title will appear alongside FINAL FANTASY XIII on the PlayStation 3 system.