I'm actually afraid to guess.

Square Enix has opened a teaser site that features a one-minute video and the words, "Secret Title 2012 Summer." No idea what it could be, but Andriasang did some translating and we know the word "Crystal" is in there (obviously), and a few familiar Summon names (Odin, Titan, and Diablos).

Check it out and see if you can come up with some ideas.