This is the new update, submitted on ThemeIt, of Metro 8. It features a big Start Menu with 8 customizable icons, and 3 hubs : Games, Medias and Social. Every hub can be customized.
Games hub is inspired by the XBox, Social comes from WP7 with a full Facebook view.
The whole theme also works in landscape, making your iPhone really looks like Windows 8 is running on it.
All credit goes to Rigatony