Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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New Renderings Show an 'iPhone 8' Design With Full-Front Display and Minimal Bezels All Around
This new iPhone 8 leak shows a device that measures 137.54 mm tall by 67.54 mm wide, nearly identical to the iPhone 7's 138.3 mm x 67.1 mm body. The thickness of the iPhone 8 is not shown on the drawing.
According to the diagram, the iPhone 8's display measures 5.768 inches on the diagonal and will indeed cover nearly the entire front of the device. There appears to be only a 4 mm bezel around all four sides of the display, with over half of that being the 2.5D curved glass at the edges and the remainder appearing to be the device's frame around the sides.
The drawing shows a narrow earpiece at the top of the device's front, with various cameras, sensors, and other components on either side of the earpiece. Those components would likely include a front-facing camera, small microphone hole, ambient light sensor, proximity sensor, and the rumored 3D sensor.
All of these components appear to be embedded within the display area itself, and while the accompanying rendered mockups based on the drawing show the earpiece appearing as a physical slit within the display area, the camera and other sensors are not depicted and it is unclear how they would appear in reality.
With the display filling the entire front of the device, there is no dedicated Home button and thus no visible Touch ID sensor. Apple has been rumored to be trying to build Touch ID into the iPhone's display, but the company has reportedly been struggling with perfecting the technology and thus could resort to putting the sensor on the rear of the device. One of the renderings shows the rear of the device with no obvious dedicated Touch ID sensor, although there is no corresponding dimensional drawing of the rear.
Notably, the rendering of the rear of the alleged iPhone 8 again shows a vertical dual camera, this time with the LED flash placed between the two cameras. As Ben Bajarin points out, the increased separation of the two lenses would help with augmented reality and 3D features, allowing for a greater difference in perspective.
iDrop News and Benjamin Geskin posted their own mockups showing a very similar design a few days ago, but it is unclear whether the two batches of renderings are based on the same original source information or if one set's creator was working from the other.
It is still early in the rumor cycle for detailed design leaks, so readers should continue to take information like this with a grain of salt until the information begin to solidify around a single specific design, but given KK's history of leaks this one is worth considering as a possibility.
Update: The drawing and renderings shared by KK appear to have originated on ifanr, and Geskin has confirmed his renderings are based on the same drawing.