iOS 9.3 is coming in the Spring and will introduce Night Shift as well as a number of other new features.
WWDC Banners Begin Going Up at Moscone Center Ahead of Monday's Keynote
More banners will undoubtedly continue to appear inside the lobby, some of which may tease hints of Apple's announcement plans. Banners advertising specific details on keynote announcements will remain covered until after the keynote.
Apple's WWDC keynote kicks off on Monday at 10:00 AM Pacific Time, and the company will be providing a live video stream of the event.