Apple designers/developers used to mock Android developers over how fragmented the displays sizes are, as comparatively Apple had very few screen sizes to work with: iPad, iPhone 3.5”, and iPhone 4”. Today, Apple added in two more screen sizes, but created a much bigger design challenge.
It’s early, and we don’t know much, but the one thing that worries me is the design overhead in designing for the iPhone with these new phone sizes. Prior to today it was easy: design for the 4” display, and let iOS trim the content section of the app for the smaller display. And this works fairly well because the width of the devices was/is the same.
But that changes today.