Don't know much about Trek-lore, but the teaser certainly gives me the impression that Kirk & co are leaving Cumberbatchs character behind early in the film for whatever reason, in what could be considered some sense of betrayal. Hence, he returns for revenge and that's the main plot of the film.
That pic of the hands and glass in-between, could be Cumberbatch and Kirk just before Kirk 'dispatches' or sacrifices him for the greater good.