http://www.xbox.com/en-US/live...y.htm
xbox.com article wrote:The "Bring Down the Sky" content pack will be released to Xbox LIVE® Marketplace on Monday, March 10 at 2:00 A.M. PST, and will be available for 400 Microsoft points. This is the first in a series of planned downloadable content that further expands the Mass Effect universe and continues the adventures of Commander Shepard and the crew of the Normandy.
Sounds pretty cool. I've only played Mass Effect for a total of about an hour since I got it, but I'll get into it soon. I've had a lot to do and other games to play. For 400 points it sounds like a steal.