I cancelled my AT&T Next Up order (30 Month Installment +$5/mo fee) due to the cloudiness of trading in at 12 months next year. Apple is still offering the AT&T Next Every Year Plan for 24 installments. I just place a new order with Apple.com for Pick Up in store on Sept 20 with AT&T Next Every Year.
This is what is posted in the FAQs on AT&T.com on the new Next Up Plan webpage.
The AT&T Next® and AT&T Next Every Year® Plans are being discontinued and are available only from select non-AT&T dealers for only a limited time.
You can trade in and upgrade your smartphone pursuant to the existing AT&T Next® and AT&T Next Every Year® trade-in terms. When you trade in your smartphone, you will have a choice between the AT&T Installment Plan and the AT&T Installment Plan with Next Up unless the AT&T Next® or AT&T Next Every Plan® is offered by a non-AT&T dealer.