The upcoming SWTOR Expansion Onslaught will introduce a many changes for each Class in the game. Players will among other things experience new abilities, Set Bonuses, and Tactical items.To help explain it all, The developers over at BioWare are releasing a series of articles featuring each Advanced Classs new ability, as well as new Set Bonuses and Tactical items. In todays article they are showcasing the Marauder and Sentinel Advanced Classes!
Source: N4G PC A Day in the Life of Marauders and Sentinels: The 6.0 Experience Explained