iOS 9.3 is coming in the Spring and will introduce Night Shift as well as a number of other new features.
Online Orders for iPhone 5s Begin at 12:01 AM Pacific Time on Friday, September 20
In an email sent out to Apple customers today promoting the start of iPhone 5c pre-orders, the company also confirmed that orders for the iPhone 5s will similarly go live at 12:01 AM Pacific Time on September 20. (In an apparent error, the company's email says Pacific Standard Time, but Daylight Saving Time remains in effect until early November.)
With no pre-order process for the iPhone 5s, orders will simply ship when they are ready, and supplies are expected to be tight.
For those who want to make sure they are able to obtain the iPhone 5s on launch day, Apple will be opening its retail stores at 8:00 AM local time to begin sales. Lines will undoubtedly be long as customers will likely be lining up early to give themselves the best chance at securing their preferred models.