http://www.techradar.com/news/iphone-8-might-be-available-for-pre-order-from-september-15-and-hit-stores-soon-after

We already know that Apple will announce the iPhone 8 – or the iPhone X or iPhone Edition as it might be called – on September 12, and it seems like you might not have to wait long after that to put your order in for one, or even to have it in your possession.

According to German site Macerkopf, Apple will open iPhone 8 pre-orders on September 15, just three days after the phone is announced.