First case specifications for the iPhone 6s have been released with height, width, and thickness of the next model. According to this spec sheet, case-makers might have to make some tiny adjustments to their molds. While the iPhone 6s will be the same width and height as its predecessor, it'll be just .2mm thicker. This means that the rubberiest of cases will be fine, while hard metal and plastic cases will need to be made anew. It also means there's more inside this device.