iOS9: Will App Thinning work on older iOS version before iOS9?

Question

Apple brings App Thinning with iOS 9, by theory, the thinning process is done on apple's server, I understand it as apple compiles my App from bitcode to machine code.

So if I submit an App built with iOS 9 SDK, will Apple also slice my package for older version iOS systems like iOS 7 and iOS 8?

Answer 1

According to App thinning Docs:

Note: For iOS apps, sliced apps are supported on the latest iTunes and on devices running iOS 9.0 and later; otherwise, the App Store delivers universal apps to customers.

So devices with iOS 7 and iOS 8 installed will receive the universal version.

Answer 2

so I suppose that could mean that the Universal app could now be quite huge, since it's going to have many different slices. Me myself - I'm going to have at least three slices for iPad, 6" and iPods. But in the same token - most users should be upgraded to iOS 9 in a few months. Apple's conversion rate is very fast these days.