SimsVIP has discovered a reference to nightclubs existing in the Prima Guide for The Sims 4.
Bring Your Creations To Life- The new Build Mode is incredibly fun, powerful, and intuitive. We’ll show you examples, tips, and tricks that will help you create the most amazing structures ever, from mansions and nightclubs to museums and parks.
There’s no further evidence suggesting that the rumor is accurate. Although it would be cool to have more in-depth gameplay included in the basegame.