Check out Dragon Age's "Witch Hunt" DLC Trailer
Not much to add here, except that as I suggested this DLC marks the end of the Origins storyline: the trailer says this is the Warden’s last quest, not necessarily Morrigan’s. Of course, we may never see her again, I’m just putting this tidbit out there.
We also get to see Ariane, a party member for the DLC, who happens to be a “gifted Dalish warrior” who is “her clan’s best hunter.”
And, lastly, judging by Morrigan’s tone during the narration, it’s almost as if she expects you to come searching for her, she’s not surprised at all. She is, after all, the “temptation” in question.
The DLC is set to release September 7th.