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This reminds me of the early days of CD's. The CD industry touted their ability to hold an hour or more of music-but 98% of all CD's contained the same 30 minutes of music that was on the LP and nothing more. Today the industry has evolved & we have many 'enhanced' CD's. They don't affect how the music plays on a CD player so I'm not really sure how prevalent they are-I just know they're out there. They might affect how the CD plays on a computer but I prefer wearing out my sub-$100 CD player for music rather than my over-$500 PC. I guess I'm funny that way as I still replace lots of CD (DVD) drives that were worn out playing music all day.
Presumably ebooks will go a similar route, i.e. at first (now) they offer nothing more but eventually they'll be 'enhanced'. Hopefully the enhancements will be controllable, i.e. we'll be able to turn them off if we don't want them.
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