Really, I think being there at opening time is your best bet. Anything else is going to be s crap shoot, unless you have a friend working in an AT&T store with insider info. I'd say restocking is going to be pretty unpredictable, and the employees are as clueless as the rest of us.
The AT&T app used to let you see which models were in stock in real time, but I can't seem to get that to work now.
Store availability in AT&T stores should be ZERO, until preorders get filled. That's about the only way they could redeem themselves now, but they won't do that. Yes, a huge middle finger indeed. I'm going to the AT&T store tomorrow. Any info I find out, I will post.