Maths...
"3DS and the DS were the only platforms to realize a unit sales increase versus November"
He is talking about week basis avg.
Wii: < 215k per week
360: < 225k per week
DS: > 88k per week
3DS: > 200k per week
So for December...
Wii under 1,075k
PS3 under 1,125k (well... under 900k)
DS over 440k
3DS over 1,000k