Square Enix has revealed that Final Fantasy Dimensions will launch worldwide on 31 August 2012.
The mobile game (for iOS and Android) will be released as four chapter, plus a prologue. The prologue will be available free of charge, the first chapter will cost £1.99 / $2.99 / €2.39, and thereafter chapters are priced at £6.99 / $9.99 / €7.99 each.
Alternatively, you can buy the whole thing outright for £19.99 / $28.99 / €22.99.
Not cheap, then.
A few pics: