But hey, you were going to buy it anyway, and It's not like anyone would game the system just for a free beta ticket, right? Of course not.
Update: According to tipster Aaron and one of our commenters, Amazon pre-orders are now receiving StarCraft 2 beta invitations as well. We've contacted Amazon to confirm but, in the meantime, have any other Amazon customers out there received their beta key already?
Update 2: Amazon has confirmed that its StarCraft 2 pre-orders do come with beta access. The first wave of invitations was sent out today. Future pre-orders should receive their beta invitation "within a few days."