I finished playing it weeks ago, I'm on my second playthrough. There's a New Game+ feature, along with things you can only do on the second playthrough (special missions that require you to have done the regular story mission first, as well as side high-level missions that are way too hard for the first playthrough), and there's a boss (8-Arms Gilgamesh) you can only fight on the third playthrough and up. There are items, spells and summons you get only the second time you do these in the story too. Also Agito Tower, which is hell of a dungeon. 6 floors with each 100 of a particular enemy. First floor is 100 Tonberries, at some point there are 100 Behemoths, and you end up fighting Space Malboro (apparently easy compared to the rest - I never made it past the first floor). Winning gets you a dark soul (Request item you need to give to someone to get I don't know what) and Proof of Agito, basically the best accessory in the game - and probably one of the most powerful accessories in the FF franchise. Overall a really good and enjoyable game, I would buy a PS4 just for that game if there's Japanese voice acting. I can't stand the English voices.