This game has so much content in it, its actually insane. There are so many songs, so many characters, so many unlockables, just so much stuff to do. And that's not even counting the DLC, which while I don't have it, gives you access to music from like 20 other games.
This release has so much to keep you entertained, and really does celebrate the aspect of Final Fantasy that in my opinion has remained consistently excellent across its entire history, it's music. And the gameplay itself I actually found really comfortable, and better than on the 3ds titles provided.
I don't know how they could top this game, this seems like both the peak of this series, and rhythm games as a whole.