Don't Panic
There is plenty of time. Those who do not yet show eligibility may soon see it (then again, maybe not). The phone is not going to be released today. It's just the presumed announcement. AT&T's system might not have gotten to your account.
Also, don't look for rhyme or reason without intimate knowledge of how the discount system works. It just makes for frustrating posts of "Why don't I get the discount..." and "AT&T is so mean to me..." Fact is, as many have said, if you have an existing contract and they decide to let you exit that contract early so you can sign a new one, they've potentially done you a favor. In their view, they've captured a revenue source for another two years.