Following the couple of hints, BioWare officially announces Arrival for Mass Effect 2, saying the promised final DLC for the action/RPG will be released on March 29 for Windows, Xbox 360, and PlayStation 3 for 560 space bucks/£5.49. Here's word:

In Mass Effect: Arrival, Commander Shepard is sent to the edge of the galaxy to rescue an undercover operative who may have evidence of an imminent Reaper invasion that has been looming since the very beginning of the series. Returning and playing a prominent role in Mass Effect: Arrival is fan favorite Admiral Hackett, who is voiced by legendary science-fiction actor Lance Henriksen (Alien, Terminator).