Cindy reappears, with a group of neatly dressed people I've never seen, and they're all observing Jack in a bear cage. When he asks why she is with them, she replies "it's not that simple" and when he asks why they are there she says "to watch". When did she suddenly turn into a concerned but aloof observer of these events? When we met her on the plane and then among the Tailies she was very concerned about them getting off the Island. Did the Others break her? So if Cindy is going to turn up, I suspect she will also have some idea of the whereabouts of the children (and recent spoilers point to exactly that)