Update: 9to5Mac is also reporting that the iPhone 6s and 6s Plus will be made from the same 7000 series aluminum alloy as the Apple Watch, and come in the same 16GB/64GB/128GB configuration as the iPhone 6 and 6 Plus.
The iPhone 6s will reportedly look almost identical to both the iPhone 6 and 6 Plus, though with many internal changes to its casing. Internal changes will apparently include a new mounting structure for the logic board and other components.
According to photos obtained by 9to5Mac, most components visible to customers will remain unchanged:
The bottom design of the iPhone 6S is exactly the same as with the prior model, down to the number of speaker holes and the position of the headphone, microphone, and Lightning holes. This will be good news for case and accessory makers, who won't have to worry about redesigning their iPhone 6 products for the iPhone 6S.
This isn't that surprising, as the the so-called "S" iPhone models tend to have, if any, only minor external differences with their predecessors, with those changes often coming down to colors. The iPhone 6s is expected to be released later this year, and is said to include Apple's A9 system-on-a-chip, support for Force Touch, 2GB of RAM, and a 12MP camera.