Animated cover art is here: https://9to5mac.com/2020/12/10/apple-music-adding-animated-a...

However, it still feels very limited. They're all looping cinegraphs, they don't 'do' anything.

For an example of a genuinely imaginative liner notes experience, check out the floppy disk that came with Billy Idol's ambitious 1993 effort "Cyberpunk": https://www.youtube.com/watch?v=Mjl6As2lRGU