"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Dummy 'iPhone 8' Images Appear Online Suggesting Touch ID Embedded in Edge-to-Edge Display
The dummy device is purportedly a "CNC model according to Foxconn", according to the original Twitter poster, but there's no way to verify the claim one way or the other, so take the following with a big pinch of salt.
The front of the device appears to have an edge-to-edge screen with no discernible bezels, while around the back there's a vertically aligned dual-lens camera, but no other identifiable markings. That includes no rear-mounted Touch ID sensor, but also no Apple logo, either.
The sides look like stainless steel, similar to those of the iPhone 4. There are volume buttons and a mute switch on the left, and a power button and SIM tray on the right. The power button appears to be longer than on previous iPhones, however.
The poster of the images offered additional details supposedly from a source with links to Foxconn, suggesting that the "iPhone 8" will have a thickness and size similar to the current iPhone 7, while the steel edges will be finished in a polished "Space Black" color.
Apart from a further image showing off the latter feature, the poster has also shown off schematics "based on blueprints" that depict a series of components hidden beneath the top of the display, where the edges of the display are indicated by a red outline. An alleged schematic of the internal components of the next iPhone has also been shared.
Apple is thought to be testing more than 10 prototype iPhone models, so it's not yet clear what we should expect. Most rumors so far suggest the upcoming OLED iPhone will have a 5.5-inch bezel-less screen with Touch ID embedded in the front display, so there will be no home button.
However Apple is said to be having trouble integrating the Touch ID technology into the screen, and leaked design schematics have indicated that the fingerprint sensor could be moved to the rear of the device, so the final design is far from certain.
Some rumors suggest the display itself may feature edges that are curved on both sides like the Galaxy S7, but the phone may have the same slightly curved 2.5D display as the iPhone 7 due to technical challenges manufacturing the more curved version. According to analyst Ming-Chi Kuo, the glass will be built around a polished stainless steel frame that's similar in design to the Apple Watch.
More images of the dummy iPhone shown above, including one of a machined chassis, can be found here.