Apart from having customized scented booklets that match the movie, I started thinking it would be a fun idea to have the cases operate like those greeting cards that have sounds when you open them!
So imagine the case opens and you're hit with a whiff of the booklet AND a little jingle from the main title of the movie!
Some movies might just have ambient droning or BRAAAAM.
Like, picture yourself opening your "Inception 26-Disc Set: Featuring 2-discs of Expanded Score and 24-discs of Zimmer Sketches" - the lid to the jewel case opens and you hear "BRAAAMMMMM" on a tiny little speaker while the scent of Axe Body Spray washes over you all at once!!!
Talk about immersive!
That could be a new selling point for future CD releases.