Metro is the interface used by the Windows Phone, Windows 8 (the next version of Windows, currently in the preview phase), and the Xbox 360 (pictured below).
Microsoft said at last week’s Consumer Electronics Show that Windows 8 will be released on various devices throughout the year. The Windows 8 public beta is due out for the computer in February and it is speculated that the final release will be in October (three years after the release of Windows 7).
Microsoft gives five guiding principles of metro design. These principles govern not only Microsoft’s own Metro apps, but should govern applications that independent developers create as well.
The principles are:

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[...] will see Microsoft release Windows 8 and to compliment the new operating software, Microsoft has revealed that it will [...]
[...] From Transportation to Pixels: The story of Metro [2] Metro Design Language of Windows Phone 7 [3] Metro Design Principles for Windows Phone, Windows 8 & Xbox 360 [4] When Metro design falls off the tracks – The three pillars of Metro Tags: design, [...]
