Bounty Hunters should have an easier go at it now, as BioWare's handing out Hydraulic Overrides and Chaff Flares to everyone. The team also redesigned the Kolto Overload skill to give the class a huge bump to survivability when it activates. Over on the Trooper side of things, the team's brought the class' resource mechanic in line with the Trooper's Bounty Hunter counterpart. All Troopers now get Hold the Line and Diversion skills, as well as a more survival-happy Adrenaline Rush.
The smaller but still significant tweaks to the advanced classes are worth reading carefully if you play one of these classes, as there are plenty to note.