If they continued SoD, I would like it to go in a new direction. Turning Silvermoon into a raid just sounds like Sunwell redone.
I’d like them to use the various things that got cut. Stormwind sewers has a raid entrance portal. There are various zones that appear on the continental maps that don’t actually exist.
I want the horde to get ogres, and the alliance to get high elves. High elves kinda boring, tbh, but they weren’t done in other versions of WoW, so it would be somewhat new.
I want to see mage, priest, and hunter tanks. All different, but no reason all classes can’t tank. And I want warlock healers, some form of blood transfer, draining life to themselves and passing it to others. That would only leave rogues, hunters, and warriors unable to heal, and I just can’t think of a way for them to do that that makes any sense.
And WoW has always been missing a bard class. People would eat that up. Ogre bards would be sick.
And if you REALLY want to go off the wall, get rid of factions. Alliance and horde welcome in each others cities, grouping as you like. Or, make a third faction, hostile to both the other two, and the only race in it is murlocs. Or murlocs and Naga. People would play murlocs.
There are tons of opportunities that aren’t just reusing other expansions. And as for story, there really hasn’t been much in SoD. Just the crafting storyline, and the dudes in sunglasses. Other than that, it’s the same classic wow story.