Rainbird on 06 January 2010
Zelda Wii might have that kind of impact, though I suspect most of the Nintendo fans already have a Wii by now, so it might not see that kind of impact.
Gran Turismo, because it's Gran Turismo.
And I doubt Halo Reach will prove to be much of a system seller, if any, but we might have a hard time telling if it releases the same time as Natal, Gears of War 3, etc.
Can't think of any other at the moment, though both Natal and the Wands could prove to have an effect like this.
