2 new raids (likely noone here cares) 1 new story/dailies area - does have some voice acting, also if you run through it all once you get a suit of the 156 rating basic comm armor. Good catch-up mechanism for new level 55s. 3 new warzones - 4v4 deathmatch, I think they're best of of 3. I haven't tried these yet, I think they're in the queue with the regular ones.
The Transcendent One: AH... THE ROGUE CONSTRUCT. Nordom: Sense of closure: imminent.