As of September 7, 2011, Square-Enix has registered yet another domain for Final Fantasy XIII (And no, it’s not for Versus): finalfantasyxiii-3.com. While we have no idea if this means they are already planning an adventure past Noel and Serah’s, it’s interesting to note regardless. It may just be they are covering their bases for the “in case” scenario.
The company who registered the domain, Corporation Service Company, has also registered heroesofruin.com and duesex.com in the past. You can check out the registration here.
Thanks to Nova Crystallis for the tip.