If you click here you can see a page with an animated storm background with lightning striking behind the clouds. The text on the page basically says that on September 1st, they will reveal a game with Final Fantasy XIII’s main heroine, Lightning.
FINAL FANTASY XIII TEAM TO PRESENT NEW DIRECTION FOR THE SAGA OF KEY CHARACTER, LIGHTNING
The “Lightning Saga” that started with the release of FINAL FANTASY XIII, has achieved a cumulative shipment of over 9.6 million units; and in May 2012 FINAL FANTASY XIII-2 was brought to conclusion with the add-on content entitled “Lightning’s Story: Requiem of the Goddess”.
Key members of the FINAL FANTASY XIII development team including the Producer, Director and Art Director, are in preparations to present new information about the direction of Lightning’s story. This presentation will take place at an event in Tokyo to celebrate FINAL FANTASY 25th Anniversary, on 1st September 2012.
To me this clearly sounds like XIII-3 but who knows, maybe they’ll spin Lightning off into another game: Final Fantasy XIII-Lightning’s Quest for Love: Hope No More.