Windows 8 Theme for iOS 7 is a new theme launched last night in Cydia, it being conceived with the idea of giving us the possibility to change the appearance iOS 7. As the name suggests, the theme was specially designed to implement in iOS a set of changes that remind us of Windows 8, and everything boils down to icons only. Unfortunately, we don't have any special interface for applications or changes to Notifications Center/LockScreen, so don't expect to see them.
Windows 8 Theme for iOS 7 it is available for free in the repo BigBoss al Cydia.