Not to burst your bubble, but I work at a corporate AT&T store and.....no cases are arriving. More importantly, the pics of the cases that were leaked were not in AT&T official retail packaging. More than likely, it was an authorized retailer. Which still doesn't make sense because if I'm not mistaken there usually is a lag time of a few month's before they get the new iPhone, so it wouldn't make sense that they were ordering cases at all honestly.
Even more damaging is the fact that we are actually receiving a lot of new cases for the iPhone 4. My fellow tech conspiracy theorist coworker and I thought it was because they planned to sell a massive amount of them when the 4 was price dropped, but now I'm not so sure in that line of thinking.