It appears the hubbub over iTunes LP production fees was indeed unfounded. As promised last month, Apple has released the complete specifications for its Cocktail extended digital content format, aka iTunes LP for music and iTunes Extras for video content.
Along with the relevant specifications, Apple has released a series of guides explaining development, design, navigation, and asset delivery best practices, as well as how to test an iTunes LP or Extras package before submitting it to Apple. There are also special instructions to make sure your content will work on an Apple TV using the standard Apple remote.
[From Apple releases iTunes LP and Extras specs, TuneKit SDK]
I haven’t bought a complete album off iTunes yet.