Android M features that Google borrowed from Apple's iOS
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Google's I/O 2015 gave us a pretty extensive sneak peek at the features that Android M will introduce later this year; meanwhile, Cupertino showed us some of the additions that will arrive with iOS 9 during its WWDC 2015 a few days ago.
To be completely honest, both Android M and iOS 9 are certainly not oriented at visually overhauling the platforms; on the contrary, both are centered around under-the-hood improvements that aim to enhance the user experience on a more basic, fundamental level by focusing on things like performance, battery management, and general feature polishment.
Things that are NOT allowed: