Mummelmann on 26 May 2012
I honestly did not think it would be this massive, not at all. A first week of 3-3.5 million would be very good, 6.3 million is utterly bonkers.
Lifetime sales though, hard to say. 12 million is a given, 15 million not unlikely, could do even more, especially if the release one or more successful expansions. Blizzard games basically sell forever.
