From GameWatcher: “Gamescom 2019 brought good tidings for trading sim fans, as Port Royale 4 was officially unveiled by publisher Kalypso Media during last night’s Opening Night Live event.
Taking players back to the 17th century, and tasking them with building a small settlement into a profitable trading city, Port Royale will, however, not feature a multiplayer component, unlike its predecessor.”
Source: N4G PC Port Royale 4 Dev Removed Multiplayer To Make "a great singleplayer experience"