* iTunes LP lets you create digital albums that include links to listen to album songs and view lyrics, liner notes, photos and videos (such as artist interviews).
* iTunes Extras is designed to present a movie with interactive menus, bonus content, and chapter navigation, similar to those supplied by DVD or Blu-ray authors.
Apple has also published information on testing and delivering the new formats.
Complete information on building content for the new formats is available at the Apple site.
Source: http://www.podcastingnews.com/2009/11/26/apple-opens-itunes-lp-itunes-extras/
Main story: http://www.apple.com/itunes/lp-and-extras/
