Then, when players come to the Free City Of Greyhawk to sell their treasure and follow up on leads, the city maps from the Dungeon Master's Guides and the descriptions in City Locations can turn a ...

But it does so while avoiding a major misstep that previous official DnD settings (and RPG settings ... custom maps and lore conundrums. There's still plenty of time for 5e to get Greyhawk wrong.