Since one of the features of Battle for Azeroth is about ''plundering uncharted islands'' what about Plunder Isle itself which is the capital of the pirates? This expansion is the best opportunity to add it in the game since it has a really big navy/pirating theme with Kul'tiras and the pirate factions. Also this will clear things out about Jaina's older brother (Tandred Proudmoore) and Duke Falrevere existing or not because they replaced Tandred with Katherine Proudmoore as leader of Kul'tiras.