The media assumes it is gonna be iPhone 8, edition or X.
Another rumor is that Apple is starting to kill of the numbers at the end and wants to keep it simple and streamlined. They used the MacBook as an example and how they want people to just see an iPhone or MacBook, etc.
Maybe the iPhone 7s will be called the iPhone while the iPhone 8 will be called iPhone Plus or Pro.
this is just my guess!