The sequel to Bravely Default is a thing, and it's called Bravely Second -- which is a silly name, but an upgrade on the original, I guess. Square Enix has gone and opened up an official site, complete with a miniature 10 second looping musical track, and some beautiful artwork.
As an aside, the game is confirmed to take place in the same world several years later with a new character. It's also going to be on the 3DS again, which is great news for a portable that just keeps on rolling.
Bravely Second [Square Enix]