All the classes in Mass Effect 2 have been overhauled since their appearances in the original. This video highlights the Engineer class.

Mass Effect 2 is an emotionally charged shooter/RPG set in a vast science-fiction universe filled with dangerous alien life and mysterious, uncharted planets. In Mass Effect 2, players will once again step into the role of the heroic Commander Shepard, commanding a crew of some of the most dangerous operatives from across the galaxy on a challenging and potentially suicidal mission. Featuring intense action, a rich futuristic storyline, space exploration and emotionally engaging character interaction, Mass Effect 2 delivers an unparalleled cinematic experience for games. Mass Effect 2 will be available on the Xbox 360 and PC on January 26th.