Pretty sure a dev mentioned a time skip after shadowlands, and then later said that he said no such thing. So an alternate world revamp would be if next expansion takes place in future azeroth. I can't even start to think what it would look like and how it would be different, and what would make it worth an expasion. Void lords coming for azeroth? But there's zero chance they would revamp other continents like Pandaria, which would still look the same and make no sense to the player probably. Unless the only way to access those old continents is via the help of bronze dragons.