iOS 9.3 is coming in the Spring and will introduce Night Shift as well as a number of other new features.
Larger-Screen iPhone Rumors Continue with 4.9-Inch iPhone 6, iPhone 5c Successor
Rumors of an iPhone featuring a significantly larger screen have surfaced occasionally throughout the past couple of months, with The Wall Street Journal reporting in July and September that Apple had begun testing prototype iPhones with screens as large as six inches, and a report last month from NPD DisplaySearch speculating that Apple may release both a 4.7-inch and a 5.7-inch iPhone in 2014.
Currently, Apple's iPhone 5s and iPhone 5c both feature 4-inch Retina displays, compared to competitors like Samsung's Galaxy S4 that feature 5-inch displays. MacRumors released a printable papercraft version of a 5-inch iPhone back in February of this year after other rumors of a larger iPhone surfaced.