Faster LTE and Wi-Fi speeds are rumored, as is a jump in storage space with 32GB positioned as the new minimum and a 256GB option rumored at the high end (possibility limited to iPhone 7 Plus). Display improvements first introduced in the 9.7-inch iPad Pro, including the True Tone feature able to adjust the display to match ambient lighting could be offered, and the larger iPhone 7 Plus is expected to have exclusive features like 3GB RAM and a dual-lens camera for crisper, brighter images.
Apple may use the event to debut a second-generation Apple Watch, said to include better waterproofing, an improved processor, and a built-in GPS chip. Design changes are not expected for the next-generation Apple Watch, but new materials and new bands are always a possibility. Apple rotates its Apple Watch band offerings on a regular basis and we expect to see new designs this fall.
Most of Apple's Mac lineup is due for an update, but the most highly anticipated machine, the MacBook Pro, will reportedly not be debuting at the event, coming later in the year instead. It's not known if other Macs will see a refresh announcement at the event, but it's unlikely, and we're also not expecting any iPad announcements at this time.
We will, however, get an update on the prospective launch dates of iOS 10, macOS Sierra, watchOS 3, and tvOS 10. We're expecting to see iOS 10 and watchOS 3 launch shortly ahead of the release date of the next-generation iPhone (rumored to be September 16 or September 23), while macOS Sierra could come a bit later, perhaps towards the end of the month. tvOS 10, as a new operating system, could launch alongside iOS 10 or alongside macOS Sierra.
In line with past events, the September 7 event will begin at 10:00 a.m. Pacific Time. As it has done with several past events, Apple is likely to stream the event live on its website and on the Apple TV. MacRumors will also be providing full event coverage, both on MacRumors.com and through our MacRumorsLive Twitter account.