It had 1,820,000 pre-orders in the USA according to vgchartz and apparently it has only sold 1.9m in the USA? So only 80k people who bought it yesterday haven't preordered it? I call BS.
My prediction threads:
Wii U will sell under 40m units (made on 14th September 2012)
PS Vita will sell under 20m units (made on 30th September 2012)
Wii U will sell under 7m in 2013 - I was right