To put this in contrast.
WiiU sold 810K in its first month (nov 2012), then another 1.5MM in its 2nd month for 2.3M total in two months.
NS is very likely to do this in March alone assuming Nintendo does hit/exceed its 2MM target for March and 100% of initial batch sales through.
http://gamrconnect.vgchartz.com/thread.php?id=151051