During Gamescom in Germany last week Activision and Bungie have released two brand new trailers with The Taken King Prologue Cinematic as well as the We Are Guardians Trailer which can both be seen below. The second big expansion will release on September 15, 2015 for PS3, PS4, Xbox One and Xbox 360.
The Taken King Prologue Cinematic
The Taken King We Are Guardians Trailer