In a story over at 1UP reporting the early success of Wii Fit, the site states that the software and Balance Board will appear on North American shores on May 20 this year:
"Wii Fit is expected to be one of the year's biggest sellers both in Japan and abroad. North Americans can expect to see the game on May 20th… by which time presumably they'll have that 'plus-sized' Western balance board properly stress tested and ready for use."
Title and description: Nintendic, by Andrew Macarthy on January 10th, 2008