So people are freaking out about a snapshot of the DLC from mid November by one source that isn't even an official source? The core game has changed a lot since then, I expect the DLC will have too. Everyone just calm down until we hear more in the weekly update, and Bungie to officially comment on what's all in the DLC, and how it will work.
Dude from Game Informer played through the DLC. He's seen it first hand. Not sure how it can get more official than that unless Bungie has changed how it works in the time since he played it.