This would appeal to me more if I didn't get visions of people watching the 60 second videos and claiming to have "read" the book (my inner bookworm is cringing).
If you can have previews for movies, though, I don't see why you couldn't have previews for a book, assuming that's how they are actually used (because I'm sure we all know how Cliff's Notes and even literary Wikipedia entries have turned out so far; some people do legitimately use them to merely clarify the text, but far more use them as a substitute...).
Michael Jensen, the always-ahead-of-the-curve Director of the National Academies Press gave a stunningly original speech at the recent AAUP (American Association of University Presses) which, in his words, "allowed me to talk about the two issues that matter most to me: saving scholarly publishing, and saving civilization. In 16 minutes."