Ever since we heard the first rumors about Microsoft dropping the Metro moniker for its new touch interface and its app, there has been a lot of confusion about what the new interface should be called. Is it the new Windows UI? Windows 8-style UI? The modern UI? Are these Windows 8 apps or Windows Store app? Is it still Metro and all the rumors were false? Even just a day before the launch of Windows 8, most people still don't know what to call it. To clear things up, techcrunch asked Microsoft for its own official guidance today.
So here is the official guidance from Microsoft according to a company spokesperson: when you are referring to the user interface, it's the "new Windows user interface (UI)" or just "Windows user interface." When talking about apps, it's "Windows apps" or "Windows 8 apps."
Source: Techcrunch