When asked if a hypothetical sequel to Bravely Default would remain on the 3DS, the official Twitter account for the game responded:
Depending on the circumstances, I don’t think it would change. Because I think a lot of people bought a 3DS for Bravely Default.
And while this is far from confirmation that a future sequel to the game will remain on the 3DS, it does seem very likely. You can check after the break for a gallery of photos showing off the special Bravely Default Collector’s Pack.