Actually, it does. If I pay X dollars for a service, and an identical customer pays half that for the exact same service, a case could be made for antitrust.
I really don't think you could make a case. When I first signed up with T-Mobile, they had a special, 39.99 a month for 1000 minutes, but only for new subscribers. If you already had a T-Mobile plan you were out of luck.
So I don't see any reason, why AT&T couldn't offer a special iPhone plan for new customers. None at all. That's the risk of signing a 2 year contract. It's a give and take.
That's the reason why I would not sign up with AT&T until the iPhone is out and all the details are clear. I want to be able to participate in whatever "get new customers" program they might offer.
And again, i think this article got it right. I think AT&T might be up to something....