So I noticed a Easter Egg photo in Gotham Knights last night. Its amongst the right-hand screens of the main computer in the Belfry; its a picture of two girls and Barbara in her wheel chair. Now one girl is blond and the other is raven-haired, however I'm not sure whether they are Dinah and Helena (Birds of Prey reference) or Stephanie and Cass (Batgirls reference). Any players of the game want to take a swing at who they are? I'll post a screenshot later.