The latest iPhone 8 leak is an image of a purported case for the device, via KKSneakLeaks. This (admittedly) bare bones clear case gives some clues as to the device’s characteristics by the shape and cutouts in the accessory. Most prominently, the case includes a camera cutout that would snugly fit the vertically-stacked dual camera that we have seen so much in recent weeks.
It also has a noticeably longer power button and notably lacks any hole for a rear Touch ID sensor to reside. This again supports the idea that Apple will successfully integrate the fingerprint scanner into the display, rather than an earlier leak which placed the sensor below the Apple logo on the back. The general proportions of the part also confirms that the physical size of the device is comparable to the 4.7-inch iPhone 7.