A new iOS 9 feature added in beta 1 was only discovered when users attempted to update to beta 2 earlier today. This new feature will allow the operating system to intelligently delete applications if you don’t have enough free space to perform a software update. Once the update is complete, the apps will automatically be reinstalled and your data will remain intact.
Clever feature. I would say ‘something for Android to adopt’, but then I remembered I’m an idiot.