The site contains a brief plot description, which reads:
The second chapter in the Mass Effect trilogy takes you to the darkest reaches of space, where you must uncover the mystery behind the disappearance of humans across many worlds. Prepare yourself for a suicide mission to save mankind. Travel the galaxy to assemble a team of soldiers and combat specialists, and launch an all-out assault on the heart of enemy territory.
So you're off to hunt the Geth, then. And more of those big, evil spaceships. In the Geth's backyard. Should be a fun trip, then! Provided Shepherd brings another couple of sexy alien ladies/fellas along for the ride, that is.