Microsoft has released the Bring Down the Sky downloadable content on Xbox Live.
It costs 400 Points (GBP 3.40 / EUR 4.80) and offers-up an uncharted world to plod around. Or an asteroid station, if you want to be picky.
You see, some four-eyed Batarians (appearing for the first time) have claimed it as their base of operations for an extremist group, and plan to crash it into a nearby colony and kill millions. Unless you stop them. Or help them. Terrorist.
In total there should be around 90 minutes of fresh adventure on offer, as well as a new Achievement totalling 50 Gamerpoints.
It's also worth remembering that those of you too far advanced in the story will not be able to access this: you need full galaxy-exploration freedom to receive the quest and get to the asteroid.
The download is 253.40 MB, and is the first of many future additions to the widely acclaimed science fiction role-playing game.
Our Mass Effect gamepage has lots more information in that you can eat with your eyes.