Eh I was surfing GBA Temp and noticed that there were a few people interesting in translating some parts of the game maybe. It looked like somebody had even inserted some English text ingame already. So it is possible there may be a partially translated version someday. Probably menus and some other ingame text like the JUS translation.
In a partially related note the augmented reality features of the 3DS would be really cool with this game and a few others. Imagine seeing One Piece characters duke it out on your table or couch.