Here are all seven Star Wars trailers, spanning 37 years, in reverse timeline order for you to watch, starting with Episode VII, which comes out December 2015!
Episode VII - The Force Awakens
Episode VI - Return of the Jedi
Episode V - The Empire Strikes Back
Episode IV - A New Hope
Episode III - Revenge of the Sith
Episode II - Attack of the Clones
Episode I - The Phantom Menace