Coming to Wii U, PS3, Xbox 360 and PC with added second screen experience.
Square say it hasn't officially announced a release date yet.
Also coming to Xbox 360, PS3 and PC later this year.
Needs to show favourable results for third-party software to encourage further investment in the platform.
Visual improvements include smoother shadows, better lighting and anti-aliasing.
Definitive version will feature Wii U GamePad features, visual improvements and overhauled boss fights.
Wii U version of hit sci-fi RPG features a "multitude of improvements... and additional content", claims retailer.