In the latest video release from Bioware, they show us the progression of the Trooper class. It shows the progression of armor as well as weapons and also gives us a look at the two advanced classes: Commando and Vanguard.
The Commando looks to be the one to wear the heaviest armor and use the biggest weapons. He’s going to be your big ranged tank.
The Vanguard is going to use more precision weapons and be able to control their enemy through stuns and other abilities.
Take a look at the video