I'm calling it now, the Wii U version will be the only version that gets released outside of Japan. Iwata is going to make sure NOA and NOE make DQX one of the the Wii U's big titles at launch that gets advertised heavily with the system in order to maximize Western sales. Because of this, they wont want the regular Wii version to take any attention from the Wii U version, and since Dragon Quest doesn't really have a huge current installment base on the Wii in the West like Zelda did on the Gamecube, The Wii version wont leave Japan.