They haven't confirmed Spanish (language) (or Italian for that matter) (see below). In fact, I think they've actually said no to it for now, elsewhere. :/

Quote Originally Posted by May 10 producer letter
First and foremost, FINAL FANTASY XIV: A Realm Reborn will be released in summer 2013. It will be a worldwide release for the PC and PlayStation 3, available in Japanese, English, French, and German. At the end of the month we'll announce the release date, along with pricing and details on the collector's edition. We'll also start accepting preorders at the end of the month.