Unused resources for a dark theme in apps like Messages and Settings were discovered previously in iOS 10 code, fueling speculation that Apple could be laying the groundwork for a full Dark Mode in iOS 11 to coincide with an upcoming iPhone 8 release. A dark interface should help iPhone 8 conserve power because the organic light-emitting diode (OLED) display technology illuminates the individual pixels and doesn't require a power-hungry backlight.
Polish blog My Apple has put together a stunning video concept that attempts to imagine what a system-wide Dark Mode and some other sought-after rumored features of iOS 11 might look like.