Hopefully, AT&T is performing their soak test already. Otherwise, it could take long for AT&T to roll it out. I had the same experience with Motorola Atrix.
AT&T is absolutely the worst when it comes to updating their Android phones. They didn't release the 4.1.2 update for the GS3 until July 31. By then, the GS3 on all other major U.S. carriers has had the update for 2-3 months. Thankfully, I can't complain about AT&T's coverage and the quality of their LTE service.