Fans asking the question have found out that XSEED Games is considering the sequel to Unchained Blades on Nintendo 3DS. The first dungeon RPG, from developer FuRyu, was a retail release in Japan, but is coming to the US via the eShop, which has led to delays in its release. Currently XSEED is aiming for a December launch with that one.
However, an interested party posed a question about the sequel, Unchained Blades EXXIV, and received the following response: "...we're still struggling to get the original out on 3DS first. After that's finally out the door (hopefully December), then maybe we can start thinking about the sequel."
Sadly there is no news of a European release as of yet.