As had been previously rumored, Apple's next iPhone announcement will be held September 7 at 1pm ET/10am PT. Get ready for... an iPhone! One that's probably pretty familiar.
According to early reports, the next iPhone is expected to carry over basically the same design as the iPhone 6 and 6s, with the notable exception that Apple may be removing the headphone jack. But don't worry! There are plenty of decent Bluetooth headphones out there, and Apple also just happens to own a very popular headphone company, which will almost certainly be able to provide you with Lightning earbuds and wireless options.
Otherwise, it's not clear what else Apple might have on offer. On the hardware side, we're due for a new Apple Watch and MacBook Pro, but neither is a lock (or even likely) to make the stage next week. We'll probably hear more about iOS 10, but Apple covered that pretty thoroughly at WWDC a few months ago.
What's most likely is that we'll see an iterative iPhone with a deeper focus on individual components, like the camera and whatever other internals Apple's cooking up. Given how successful---and genuinely great---the current iPhone already is, that sounds just fine.