Just some random drivel. Comes from drinking too much expresso. Elayne's twins are Shivan the Destroyer and Calian the Chooser, two heroes of the Horn of Valere. They were mentioned in ACoS during one of Mat's memory flashback thingies. According to the little information given on them, Shivan and Calian are brother and sister who herald the destruction of what had been and the birth of what was to be. That sounds like something appropriate for the end of the Third Age and the upcoming Last Battle, especially for the children of the Dragon Reborn. Or not.