With analysts previously expecting the 3DS launch in 2010, Nintendo have explained why the system has been "delayed".
Whilst Nintendo hadn't outlined a specific month or day previously, a fair few have considered the confirmed February 2011 launch in Japan a "delay". According to Gamasutra, company president Satoru Iwata had told analysts that the system was originally penned for a 2011 launch in Japan, but was held by several months to meet expected demand and also improve the launch line-up from third parties.
The report also reveals Nintendo's high expectations for the system - stating a rather cool 4 million units sold by the end of March 2011, translating to an expected 4 million units in a single month? It's uncertain whether Nintendo had meant by March 2012, but various soruces have stated otherwise.