I think this is the Wii RPG I'm most looking forward too, even more than Tales of Graces (that might has to do with the fact that localisation chances for that game are very small, but anyway).
All we have seen now looks really promising and although I haven't played any Xeno games yet, these guys have also developed Baten Kaitos which is an amazing RPG of its own. I'm interested to see how the battle system works, that's always an important point in RPG's and a real-time battle system isn't the easiest thing to do. I'm sure that'll be great too though.