Since the Skywalker grandchildren were to be central characters and the EU to be referenced... Allana Solo is a teenage padawan, Ben Skywalker is a Knight in his early/mid twenties, Jaina Fel a Jedi Master in her late thirties/early forties
Since Talon is being adapted, she would have a rivalry/love story with Ben. Talon may eventually turn on Maul and decapitate him likely at the behest of someone like Darth Plagueis towards the end of the trilogy.
Maul himself would get to kill Luke Skywalker. Han and Leia may survive til the end. Jaina takes over as Grandmaster following her Uncle's death. Anakin Skywalker appears as a ghost to council Luke and/or Leia. Leia would be apprehensive about it.