Nintendo is using social networking to conduct the promotion.
http://www.nintendoworldreport.com/news/29194
Facebook users can elect one piece of Xenoblade Chronicles artwork to be featured as a reversible cover when the game releases April 6.
Users can cast their votes by clicking "like" under any of the four images posted in Nintendo's Facebook album. One cover, featuring characters overlooking a mountainous area, is currently leading the vote by about two hundred.
Nintendo of Europe ran a similar poll prior to its release in that region, though the North America cover options differ from that promotion.
Update: Voting ends on Friday, February 10.