From IGN.com:

Several free content patches for The Sims 4 have been detailed.

Starting this month and continuing through December, these patches will deliver a number of updates and changes to fix bugs and provide players with new opportunities and enhanced customization options.

The currently-available October patch includes a number of seasonal updates for Halloween and some community-demanded additions. First, the ghosts of dead Sims can now haunt the living, each with intact personalities, but whose behavior is altered according to their mode of death. Star Wars costumes for Sims have also been introduced, allowing players to dress up their characters as Princess Leia, Darth Vader, X-Wing pilot Luke Skywalker, and Jedi Master Yoda.