It is uncertain whether the phone in question is a dummy or an actual iPhone 8 prototype. ”Specialists” on the internet seem to believe that this is in fact the real deal. Anyway, a short, low quality clip shows us the device from every angle. There is a power button on the right side, volume and mute button on the left side and dual camera on the back. According to a separate leak from Slashleaks, iPhone 8’s rear will also house a fingerprint scanner, although we cannot see one here, so, dunno.
If you don’t trust my word and wish to actually see the video yourself, check it out here.