Yea, this game is doing great. I'm thinking between 8-9M by the end of 09. I think there are supply issues as well. I went out today and every store I went to that sells video games were sold out, and amazon has been sold out for a few days now. I think it'll continue to sell amazing for quite awhile.
People have been waiting nearly 20 years for this game, and the sales are showing it.