The epic RPG is hitting North America next year as an exclusive to GameStop and Nintendo's online store.
http://www.nintendoworldreport.com/news/28588
Nintendo confirmed that Xenoblade Chronicles, released in Europe in August, is coming to North America in April 2012.
News broke earlier this morning that GameStop had a possible exclusive version listed on their upcoming line-up of games. Following that, Nintendo posted images from Xenoblade Chronicles on their Facebook. Finally, the company posted this statement: "It's confirmed! Next year, Wii players throughout North America can wield the Monado blade and join the epic battle between the Homs and the Mechons in Xenoblade Chronicles. Like this post if you're ready for an adventure on the surface of two frozen Titans!"
An official page is up, which shows off an April 2012 release. Also on that page are two links: one says "Pre-order at GameStop" and the other says "Pre-order from Nintendo." Each link goes to a page on the respective stores to pre-order the game. Nintendo's pre-orders don't begin until December 19, while you can pre-order from GameStop, which gives the game an April 2, 2012 release date, right now.
UPDATE: A press release confirms that Xenoblade Chronicles will only be available through GameStop and Nintendo's online store.