Depends on what you're exactly talking about. What degree of 'rehash' are you talking about? In the broadest terms, revisiting the Legion at all could be considered 'Rehash', because we've already fought demons on a different planet. If we revisit a revamped Outland as a platform to launch a campaign against other worlds, would you also consider that 'rehash'?
People like the Burning Legion as an enemy.
Sure they are. Demon Hunters are whatever Blizzard defines them to be.Then they aren't Demon Hunters.
So Tinkers are based on Titan technology now? I don't see how that would be relevant to Tinkers. It confuses the situation even more.Actually there's legion tech all over the place. Let's also not forget that the only way we could possibly defeat Sageras is with Titan Technology.