anyone who bought the current iphone is still eligible to receive any subsidy! this is because you didn't get a subsidy on your last phone so that subsidy is still available on your account! go to your wireless.att.com page and hit the check for upgrade button and you'll see that you can get the upgrade at the subsidized price, you'll just have to renew your contract
Hmm my account only says this "You can take advantage of our no-commitment pricing option. This line may be eligible for an equipment discount on 03/02/2009 More Details"