Apple says 'app slicing' isn't yet available for iOS 9 apps
The 'app slicing' feature in iOS 9 that enabled developers to send optimally-sized variants of their apps to different devices is unavailable because of a bug in iCloud, Apple's cloud service for its devices.
Slicing is one of three components of Apple's app-thinning process that enables developers to install iOS apps by matching app delivery to the capabilities of the user’s particular device, with a resultant smaller footprint.
App variants created by slicing the app contain only the executable architecture and resources that the target device needs. Thus code designed for devices running 64-bit processors would not download to those running 32-bit processors. Image resources are also sliced by their resolution and device family.
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