If you're a fan of the well-written and deeply involving story of the Mass Effect saga, you won't want to miss out on the final content update for Mass Effect 2. The Arrival officially launched for the game today, adding the final piece of story that will bridge the gap between Mass Effect 2 and Mass Effect 3, which is scheduled to launch later this year.
The Arrival tasks the stories main character with locating a deep cover agent in Batarian space, who went missing after reporting an imminent Reaper invasion. What will Commander Shepard find waiting on the edge of the galaxy? That remains a mystery, but we can speculate that it will in some way lead to the invasion of Earth that we saw in the Mass Effect 3 trailer.
Source: Mass Effect 2 website