I don't think awakening would tell the story of dragon age 2 cuz for one thing I learned, the time period takes place before the blight in dragon age 2 and awakening is after the blight so unless bioware messed up, awakening is just a DLC the size of a game.
I must say, it is the best DLC for any game I have ever played! Finally started it today....also got fear 2 x.x