Still stuck on
"Processing Information.
Please wait while we access your ATT account information."
For those who succeeded - should I keep waiting it out, or abort and try again (and again...)?
To answer my own question (for those who are still trying). Lengthy waits never worked for me. After I kept aborting and retrying finally I got lucky and each step went through pretty quickly. It confirmed my eligibility and I reserved a 32 GB phone for pickup at an Apple store.
Cheers!