I don't think this is stricly true. NPD definitely haven't released any official data yet but these are estimates, likely leaked from people 'in the know'. So basically I wouldn't take them as fact but should be a good indicator. None of the numbers are much different to industry predictions anyway - Wii on par with DS / GC launch, PS3 supply limited and Xbox 360 doing 1.2m Dec off the back of 500k November (USA only). All seems pretty reasonable...