Apple sets May 1 deadline for UDID, iPhone 5 app changes
Apps that don't support Apple's latest iOS device displays are on their way out, as are apps that haven't been updated to address a longstanding privacy concern. On Thursday, Apple informed iOS App developers that as of May 1, the App Store will stop accepting new apps or app updates that access a device's unique identifier or fail to support Retina devices and the iPhone 5.
As reported by 9to5Mac (and confirmed by Macworld), Apple alerted developers of a cut-off date for new apps or app updates that access an iOS device’s UDID (Universal Device ID), an area of security and privacy concern.
With iOS 6, Apple introduced a new way for app makers and advertisers to identify individual iOS devices, and warned developers that the old method would eventually be deprecated. Developers who haven't adopt the new method will now need to scurry.
The other change to Apple's guidelines involves iOS model support. Many apps now take advantage of the taller, 4-inch screen on the iPhone 5. Starting May 1, Apple will require all iPhone apps to do so, as well as support iOS devices with Retina displays in general.