My Experience
So, I was super stoked when I heard about this this morning and headed off to my local Starbucks. Unsure of what to use as my password I called customer service who forwarded me to the wi-fi hotspot specialist. (I got the normal AT&T login screen, not the iPhone specific login). He didn't question why I was expecting to get free internet as an iPhone user and tried to help me login, which he was unable to do. He conceded that they had been "having trouble with some of the hot-spots" today, inferring lack of firmware at some of the locations. Maybe this is the cause of the rise and fall of the 4th AT&T Empire to the infamous, clueless employee who marked the release date on his Romulan calendar by mistake. This was at 1pm CNT time several hours after the denounced folly.