There has been news going around that due to a naming dispute with a European partner (Metro Group) that Windows New Layout For Windows 8 can no longer be referred to as a Metro UI but "Windows 8,", according to some sources. It's said that references to "Metro design" will be replaced with "Windows 8 Design", thought not yet confirmed by Microsoft Executives publicly.So the Metro interface on Windows Phone is now known as the "Windows 8 interface" on Windows Phone.
Credit: ZDNET