One of the more forward looking of the Rock bands, Nine Inch Nails have produced a secret album, left around at gigs for people to find, on a USB pen drive.
Future audio formats will be developments of the data-compressed digital codecs (yes, I do know what I'm talking about, but you really don't want to know any more technical details, honestly!) like an inmproved version of MP3- of which there are already several.
Cheers
Dave