GameInformer just unleashed a pretty tasty glimpse at The Dark Below in a video with Jason Jones, Lars Bakken, M. E. Chung, Ryan Ellis, Luke Smith... okay, half of Bungie apparently. There's a lot crammed into those four minutes! Go watch the video here.
I missed this originally, but Bungie posted the cinematic trailer for Destiny's first expansion: The Dark Below (it had been discovered in the 1.0.3 patch update, but now Bungie has officially published it). Narrated by the new Tower character, Eris, the prologue sets the stage for December 9th. Can't wait!