The following details are from a Square Enix press release:
World of Final Fantasy, a brand-new title in the Final Fantasy franchise, combines classic RPG gameplay mechanics with fresh and imaginative toy-like visuals to welcome both fans and newcomers to the series. Players will lead a pair of twins through varied Final Fantasy worlds and capture and raise such adorably familiar beasts as cactuar, chocobo and behemoth to discover alternate forms and learn new abilities.