The photos above show an unmanaged iPhone dummy, which show the real design of the next Apple smartphone. These models are usually made for case manufacturers, which can then work with their accessories even before a new device is released. The source is surely reliable and this could actually be the definitive design of the iPhone 8: there is a glass back, a double vertical camera with chromed edges and no hole for the Touch ID.
On the edges you notice the same power button as the one mounted on the iPhone 7, as well as the volume keys that are always physical. Even at the bottom, the design remains unchanged with microphone and loudspeaker grids, along with the hole for the Lightning port.