iOS 9.3 is coming in the Spring and will introduce Night Shift as well as a number of other new features.
WWDC: iPhone Release Time, Developer Access
Also announced was that Apple was making it possible for developers to write small, Widget-like programs for the iPhone. A demonstration was given showing a corporate LDAP directory lookup application. All such applications will run within Safari to maintain the security of the iPhone.
The New York Times had previously reported that a developers kit would be forthcoming.
MacRumors would like to thank our sponsors, who made live coverage of the WWDC keynote possible.