Mushilda created 2 excellent illustrations on how The Sims 4 Worlds will function!
Please note that pictures below are just an illustration of Willow Creek to show how Worlds and Neighborhoods function, meaning that the map of Willow Creek probably doesn’t look like it’s shown below.
Each World (in this situation, Wilow Creek) has up to 5 neighborhoods. Each neighborhood can contain up to 5 lots (both Community and Residental).
Public space of each neighborhood can contain various objects that are either decorative or interactive.
There is loading between: Worlds, Neighborhoods and Lots. There can only be 1 active lot + public space of a single neighborhood.