9/12/2018 @2:18pm: The iPhone XR has been announced! Read the full recap: iPhone XR Recap

Apple is hosting an event, called “Gather round”, at the Steve Jobs theaters on the new Apple Campus in Cupertino, California, on September 12th, at 10am Pacific Time.
Gather Round iPhone XS event invitation
The expectation is that Apple will launch three new iPhones: the iPhone XS, the iPhone XS Max, and the iPhone XR. It’s also rumored that Apple will be unveiling a newer, larger Apple Watch model.
iPhone XS MAX launch event
There are other speculations of what to expect, in addition to the new iPhone and Watch models. Experts say we will hear the details, finals before launch, of the official launch date of iOS 12, as well as the new computer operating system – MacOS Mojave. Experts also speculate we’ll hear the final details regarding WatchOS 5 and tvOS 12 as well.
Apple is providing a live video stream on its website, using the Apple Events app on AppleTV.