Mass Effect 2 - Overlord DLC Announced

Microsoft has revealed a new Mass Effect 2 DLC titled Overlord, due next month for 560 point thingies.  This one sounds a little more substantial, with "5 level areas":

When sent to investigate a Cerberus research base that's mysteriously gone silent, Shepard arrives to find Geth overrunning the base. The sole survivor, Chief Scientist Archer, paints a dire picture: an experiment to fuse a human volunteer with a virtual intelligence created a dangerous hybrid "VI overlord". The rampaging VI has already attacked three other Cerberus bases, controlling any technology it finds in an attempt to break free–and unleashing Geth across the planet. Unless Shepard can infiltrate the VI's fortress and shut it down, this homicidal intelligence will beam itself-off planet and wreak havoc on other systems. The action unfolds over five new level areas, with two new achievements.

According to brief articles at Gamerzines and Incgamers, this one will have a bit of a horror vibe and be "less linear":

The Hammerhead vehicle will function as your means of transport around the "hub" section of the planet, between the missions. We've been told to expect a bit more of a horror vibe from the DLC, as well as bits that go a little Tron.