No information on revival events yet.
Deina and Deine are sisters. Not remade.
Black Healer Iris and Gold Healer Iris are two different units. If I'm correct Gold Healer Iris would be spelt Irisu in Romanji. Though Romanji is terrible, but their names are actually....
Black Iris: イリス
Gold Iris: イーリス
That was because when they said Monks or Vampires we all started backing the 'skipped' events that would have happened if it was the monk event. Shiho was one of those. So honestly my guess is Monks or Dark Fighters.