I think we’re still a bit far out for a Jedi Luke hero’s journey. My guess is that would be some time next year, after we see a few more RotJ toons released. Luke’s hero’s journey culminates in him confronting Vader, and Vader defeating the emperor, so the twist may be requiring a 7* Vader to fight the emperor in the last battle.
I’m putting my money on some other hero’s journey first, if there’s going to be one this year. Potentially a legendary DS Revan followed by a LS Revan Hero’s journey (requiring the old rep toons and DS Revan).