i think it will, the reason being that the reviews this game has gotten have been extremely positive, i mean just try reading (or listening to) some reviews out right now, they praise the game so much, the words they use in describing are so beautiful, it makes you want the game SO badly
also, the game got a lot of perfect scores, the most influential ones besing the perfect scores it got from IGN and Gamespot; some of the most populat (if not THE most popular) gaming sites on the net today, as well the 10 from EDGE which is known to be a fairly harsh reviewer (generally)
also, look at the US & japanese opening so far, i know sequels are usually frontloaded but SMG2 has really done a great job in beating it's predecessor's first week by a lot, and the 'others' data still hasn't been added yet! which, i may add, is expected to be the biggest mario game launch ever (i read that here on VGChartz)
good luck Super Mario Galaxy TWO!!! :D
