Has anyone seen the Denim update for AT&T yet lol. Just kidding.. It's sad that we haven't gotten the update as of yet for the 1520 US.
This is why you buy your phones unlocked and unbranded for full price. (or at least flash to an unbranded ROM - however it could cause some complications) You could probably save money too in the long run with prepaid MVNOs.
Get used to it, but hey, at least AT&T hasn't reached the level of delay it gave Windows Phone 8.0 GDR2 + Lumia Amber for the 820 and 920.