iPhone 6s Design
iPhone 6s rumors have hinted at minimal design changes. In other words, this year's iPhone probably won't be the iPhone 7 with a redesign.
Instead, the iPhone 6s and iPhone 6s Plus are expected to look a whole lot like the iPhone 6 and iPhone 6 Plus. That means an all-metal design, Touch ID fingerprint sensor, and those ugly antenna lines that run across the back.
The iPhone 6s could be a little thicker than its predecessors with renders hinting at a .02mm change to the thickness of the form factor. It's still not clear why Apple might make this change though some believe that it could be in response to last year's Bendgate issues or to help fit features under the hood.
Whatever the case, don't expect this year's iPhones to look a whole lot different than last year's iPhones. The redesign you're looking for probably won't come until next year.