Previously only available on your computer, iTunes Extras will be coming to iOS 8 this fall.
http://www.macrumors.com/2014/07/10/itunes-11-3-itunes-extras-apple-tv-ios-8/
http://www.macrumors.com/2014/07/10/itunes-11-3-itunes-extras-apple-tv-ios-8/
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