Like it or not, the evidence is piling up.
Here's what we know: Anybody who completed Final Fantasy XIII-2 is well aware of the number of unfinished plot points, not all of which were satisfied by the seven alternate endings or by the extra downloadable content. That's first and most obvious.
Second, we know that Square Enix has said on multiple occasions that they have to release games at a faster clip in order to be competitive. When they say this in interviews, they often cite Western franchises…franchises that typically get annual installments. It was less than two years between the North American release of FFXIII and FFXIII-2 and S-E said even that was too long. Thirdly and lastly, the hints pertaining to a new Lighting storyline are everywhere, and the latest clue implies that the next step won't just be DLC…
Check this website : After confirming that the "Lightning Saga" that began with FFXIII has shipped a total of 9.6 million units, they said FFXIII-2 was "brought to conclusion with the add-on content entitled 'Lightning's Story: Requiem of the Goddess.'" Okay, so that means FFXIII-2 is done, right? And yet, there's this very clear implication-
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.
Brace yourselves because yeah, we say FFXIII-3 is coming. Soon.