iTunes 11.3 update allows iTunes Extras landing on Apple TV, iOS 6.2 8, and Mac HD movies
Apple launched the iTunes 11.3 today. Install this update, iTunes Extras function will apply to HD movies purchased from the iTunes Store, stored in Mac. In addition, Apple TV (need to upgrade to 6.2) users can also enjoy this function. As for the iPhone and the iPad user, you may need to wait for iOS 8 this fall。
iTunes Extras can add more interactive experience for some video content, including: behind the scenes video, images, cast and comments, actor interviews, exclusive footage, short films, etc. But this is not mandatory – the cast can choose to use the iTunes Extras or not. If cast and want a try, apple has provided the template. Also, before buy HD movies automatically, free to add iTunes Extras.