One of the biggest (and unexpected) hits in the DreamWorks Animation catalog is their medieval adventure story How To Train Your Dragon. Delightful, fanciful, funny and heartwarming that story, about a boy and his dragon, just keeps giving and giving and now, best of all, DreamWorks Animation is giving us a sequel. The trailer for this follow-up to the 2010 film just hit and it looks like more high-flying fun. It features the return of the original cast as well as that patented DreamWorks charm. Enjoy! It’s been five years since Hiccup and Toothless successfully united dragons and vikings on the island of Berk. While Astrid, Snoutlout and the rest…