I think this UI update is designed to distinguish native applications on iOS from non-native.

Folks aren't going to be able to simply pound out a bunch of new icons to make their non-apple toolkit apps look "native". There's far too much compositing and such going on here.

I doubt Google is going to rush out and try to mimic the L&F either.

This MAY give native iOS apps a leg up over web and other "portable" toolkit apps.