So as of today several retailers (not just gamestop) have Xenoblade listed for the WiiU (not Wii).
The price is listed at $59.99 and has a date place holder of december 31st 2014 (but will likely be released sooner. It is mostlike a WiiU HD remake of the Wii game and will be released before X for the WiiU which is suppose to be release later this year as well. Both of which we will probably hear more about later this year.
Yes I saw this while looking up xeno games on store websites... and yes I do that for MH games as well http://www.walmart.com/ip/Xenoblade-Wii-U/23428791