Read more here: http://www.eurogamer.net/articles/2012-12-07-wii-u-sees-healt...
Here's a quote:
"The Wii U sold 425,000 units during its US launch week, Nintendo has revealed. That's just 5000 less than the Wii recorded six years ago."
Wow, great figures I feel. Especially with the current economy situation and with big competition with tablets, smartphones ect.. Good job ninty. 
But MS smashed Nintendo as they sold more xbox 360's than both Wii and Wii-U combined.... Just wow.

/drools