The official trailer for Jurassic World drops next Thursday, but Universal is teasing the Thanksgiving treat with a 15-second preview. Directed by Colin Trevorrow from a screenplay he penned with Derek Connolly, there's been much kept under wraps about the new film's plot. But we do know that it involves a theme park, and, natch, dinosaurs (some of them genetically modified). The last new Jurassic Park movie was in 2001, although Universal in 2013 released Jurassic Park 3D…