Final Fantasy Agito Returns
Back before Final Fantasy Type-O (shown) released in Japan for the PSP, the game was known as Final Fantasy Agito XIII. Now Square Enix is planning to release a title called Final Fantasy Agito for the iOS and Android platforms in Japan.
The trademark for the name was re-registered earlier this year, and the title is set in the world of Orience from Type-O (also containing some that game's characters). It's a free-to-play RPG offering players story choices, boss battles, and microtransactions.
Final Fantasy Agito is set to come out in Japan this winter. No U.S. release date has been announced.
I know that many people have problems with free-to-play/microtransaction-based titles, but RPGs in general seem like they would be a great choice for phones; requiring few concessions.