Would love to see a dark mode in iOS 9 but I doubt it will happen. Apple could give all the stock apps dark mode versions, and offer app developers ways to optimise their apps for light/dark mode operation as per the system setting. They could have dark mode activate automatically at sunset, or a certain time of day. Apps where I wish dark mode was a thing particularly is Photos. iOS 7+ is too white I feel, minimalist and clean but very stark especially checking a text in bed at night.