I just took that scene in the finale as that unique copy of Dolores is dead. Keep in mind, there is a copy of Dolores in the Hale body. We also know a copy of her personality was also in a Musashi body So the Dolores we see in the trailer is another copy, but we don't know where her alligencies lie or her opinion on Humanity is. To me, it's not that different from Battlestar Galactica with the Cylons. Each Model Six (Tricia Helfer) Cylon are unique, not in physical appearance, but in their personalities that they feel distinct from one another. For the Model 8s (Grace Park), Boomer and Athena both act slightly different from the rest of their models, in addition to acting differently from one another. So, who knows if the Dolores we see is going to be a friend or a foe, and whom she will be that to.