Are you saying, "What's a book trailer?" Well, it's a wonderful little tool that publishers are beginning to use to get their books out there to the public.
I saw the ones for Guillermo del Toro and Chuck Hogan's "The Strain" and I was convinced to get the book (plus, it had del Toro's name attached so I would have bought it anyway). This time it's for Scott Westerfield's "Leviathan" and it looks awesome!
Set in 1914 and Archduke Franz Ferdinand has been assassinated and Europe is just about to go to war. But this is a different timeline, an alternate history filled with two warring sides: The Clankers who use machinery to do their bidding and Darwinists who evolve living creatures to do their bidding. At the center of it all there is Alec who is running from those who killed his father (the Archduke) and Darrin Sharpe (not sure if that's the name...it was hard to tell what the name really is) who is a girl living as a boy who wants to serve in the Royal Air Navy. They are on opposing sides and one is hiding a secret.
I love Steampunk and Sci-Fi, so I'm all over this book. As long as it isn't written for too young an audience.