Ickalanda on 12 November 2008
It probably will once you combine all the 1st day sales of every region maybe. Halo 3 was lucky in the fact that a huge majority of it's fanbase was all in the same place (U.S.) where as WoW is a much more worldwide phenomenon.
Also a huge number of WoW sales aren't store bought but online sales since most people pay to play with a credit card anyway so they just buy it online. We will probably never hear actual sales numbers.
