"Using the new technology, music labels and bands will be able to send updates to the music files – with tour dates, interviews or updates to social networking pages – while illegally-downloaded files remain static. "
It seems to me that an unspoken option to the above is that not only can content be added, it can also be removed or changed. Imagine having an 'Enhanced' MP3 with explicit language that you've paid for. Two weeks later, some parents' group sues the record publisher over the content of the track. The very next time you listen to the track, the original language has been replaced by a reference to warm puppies.
I'll take my music unchangable, thank you.