From September 5th 2010 to January 1st 2011 the DS sold 10.5 Million units worldwide ...
While I doubt the 3DS could see similar sales, I think that (after the price cut) the 3DS could sell at 2/3 to 3/4 the pace the DS had last year, which sould put year end sales at 10 to 13 Million. With that in mind, I voted for 11 to 12 Million







