There have been a lot of articles in writers' newletters recently on the topic of book trailers. It seems, in these tough and competitive times, that authors are expected to produce short videos promoting their own books, to be shown on YouTube, Amazon, or blogs like this one. I mean scenes acted out by live or animated characters, or at least a voice-over ("In a world...").
Don't bother watching this space for that sort of entertainment, dear reader. The more I read about this, the more inane and rife with nightmares such a project sounds. Besides the obvious production problems of finding affordable professional-level actors, animators, and videographers, there are also myriad legal issues. An essay in the new SCBWI Bulletin mentions how copyrights on music and images might get you into trouble, not to mention the fact that some author's contracts prohibit the use of one's own text for this purpose.
Let me know when book trailers are out of beta phase and maybe I'll test the waters.