iOS 9.3 is coming in the Spring and will introduce Night Shift as well as a number of other new features.
'Evasi0n' Arrives as First Untethered Jailbreak for iPhone 5 and iOS 6.x
Evasi0n is available for OS X, Windows, and Linux and provides a quick method for users to jailbreak their devices to make use of unauthorized like themes, tweaks, and apps from sources other than the App Store.
As an untethered jailbreak, users only need to apply the Evasi0n jailbreak once, making for a seamless user experience. Tethered jailbreaks requires users to have their devices connected to a computer each time they restart.