Well having found the official website, it seems that Square/Enix are going back to an MMORPG. Not much information to go by at this moment in time. Website has the same video as shown at the Sony E3 briefing, with some more screen shots, but no in game from what i've seen so far.
http://eu.finalfantasyxiv.com/
So can Square/Enix pull this off? FFXI was pretty successful for them, with the game still going, which is more than can be said for some other MMORPG's, and across 3 different platforms.