This post contains major spoilers for the ending of Ziost.
Yesterday, Bioware unlocked the final part of Ziost. It was a pretty interesting outcome.
The Sith Emperor Vitiate won. He consumed all life on the planet Ziost. What this means in terms of future story is unknown, but it looks like Bioware are setting up Vitiate as the major villain going forward. I imagine the next expansion will focus on him.
Ziost also has a new daily area on the ruined planet. It is unusual because it is empty. There are no mobs other than a couple of champion sith monstrosities wandering around. The daily quests involve recovering data from dead bodies, crashed probes, and destroyed temples.
It's very atmospheric, and a neat change of pace.
In some ways, this is the most frustrating part of TOR. They've cut back significantly on the best part of TOR: the multiple unique stories. TOR went from eight class stories, to two faction stories, and now only has one combined story.
But at the same time, they do try new and interesting things like Ziost. It's a real pity that they do not have the budget they originally had. I think the current team might have been able to do a lot with more resources.