I was under the impression the girl Edith is holding in the series 5 spoiler photo was Sybbie - she seems a bit too old to be Edith's daughter just yet. But if it is Edith's daughter, then it would have to be from the Christmas special with perhaps a year jump like the special for series 3 (unless I'm mistaken Series 5 begins around six months after the end of series 4). And if it is Edith's daughter and they are together, perhaps then there is hope for Edith fans like me that Gregson returns. But I'm just saying, we cannot be sure if that is Edith's daughter or Sybbie.