An iPhone 6-like Design
Thanks to a series of part leaks, we're confident that the iPhone 6s and iPhone 6s Plus designs will be similar to the designs found on the iPhone 6 and iPhone 6 Plus.
There's talk about some small changes to the dimensions (we're talking millimeters) but the increased thickness and width could mean a sturdier design. Apple clearly doesn't want to deal with another Bendgate controversy.
As for the rest of the design, expect it to be very similar to last year's models. That means Touch ID. That means an all-metal form factor.