Bravely Default: Fairy's Effect coming to smartphones in 2017
The game will be released on mobile devices as Bravely Default: Fairy's Effect, the same name used by Square Enix when it launched the game in Japan. Little is known about Square Enix's plans about the upcoming mobile title, but at least we know the publisher is pretty serious about mobile gaming.
Let's not forget that Nintendo announced it will launch Super Mario Run platformer on iOS in early 2017. It's even decided to delay the release of two other mobile games in order to be able to respect the deadline.
Even if Bravely Default: Fairy's Effect and Super Mario Run will be released on smartphones around the same time, they probably won't compete with each other since they're different genres.
source: Square Enix via Gematsu
Things that are NOT allowed: