Four Million pre-orders for Halo 3

Halo3 comes out on Sep 25th and there are already 4 million pre-orders.
By comparison, Halo 2 had 1.5 Million pre-orders when it was released ~3 years ago; and Halo 2 was the most pre-ordered game ever.
Could Halo 3 be the biggest game release of all time?
Update: Make that four million and one. I just pre-ordered mine and I can't wait for 12:01am on 25 Sep.

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