It looks like a US and EU release is in the cards
News for Final Fantasy Explorers has been exploding over the past few weeks, ever since its debut during the week of E3 by way of Jump Magazine. According to Nintendo Everything the game has been trademarked by Square Enix not only in the US, but in Europe as well, pointing towards a possible overseas release.
It makes perfect sense too, since localizing almost everything on the 3DS is a good idea given the huge adoption rate. Keep in mind though that a trademark doesn't 100% confirm a localization, as Square Enix will have to official announce it before we can start getting excited.
Final Fantasy Explorers trademarked in the US and Europe [Nintendo Everything]