Bungie put together a new trailer for Destiny: The Taken King today. This trailer shows us how we're all Guardians and we're all Legend and there's a new threat, Oryx, that's going to be like "no, you suck" and you'll be all like "whatevs."
We are Guardians. We are Hunters, Titans, and Warlocks. We have fought back the Darkness together. But now a new threat looms on the horizon: Oryx, The Taken King. Battle the greatest villain we have ever faced and begin the next Destiny adventure on September 15th. Join us and Become Legend.

The release of The Taken King DLC will be preceded by a major patch for the game that adds in story. Seriously. They're supposedly adding in a means to listen/view the Grimoire lore stuff inside the actual game. This is in addition to Nathan Drake being the new voice of the Ghost.