http://www.gamesindustry.biz/articles/2012-12-07-halo-4-sold-3-2m-in-us-during-november
Halo 4 sold 3.2m according to NPD figure and we all knew NPD doesn't count bundles. So plus some bundles, Halo 4 would be sold > 3.3M I guess.
And I really don't understand why people here are so against Halo. You may be not a 360 fan, but please, don't down play a fantastic game, OK?