Bioware has released five new images and a video dedicated to Mass Effect 2 in which there is shown in detail one of the classes in the game, one called "Sentinel". This class includes both biotic and technological powers, we will be able to progress further usifruire of tech armor that can increase the power of the shields and to release a burst of energy that will serve to kill the enemies in the surrounding area.

Mass Effect 2 - Sentinel Class Trailer