Very interesting: it seem's Apple are allowing apps to show an "alternative" app icon. They aren't dynamic like the Clock app icon, but developers can bundle in any number of alternative app icons to be shown on the homescreen. It also seems to be supported on tvOS. If you're a developer you can read up on them below:
https://developer.apple.com/reference/uikit/uiapplication/2806815-supportsalternateicons
https://developer.apple.com/reference/uikit/uiapplication/2806808-alternateiconname
https://developer.apple.com/reference/uikit/uiapplication/2806818-setalternateiconname
https://developer.apple.com/reference/uikit/uiapplication/2806815-supportsalternateicons
https://developer.apple.com/reference/uikit/uiapplication/2806808-alternateiconname
https://developer.apple.com/reference/uikit/uiapplication/2806818-setalternateiconname
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