https://www.techradar.com/news/macos-catalina

Apple has revealed that the name for macOS 10.15 is officially macOS Catalina. The company made the news via its live keynote address at its WWDC 2019 conference in San Jose, California.

The company's head of software Craig Federighi showed off the new name and look for macOS during the keynote, confirming that this version will kill off iTunes in lieu of new apps for Apple Music, Apple Podcasts and Apple TV. Each of these new macOS versions gain enhanced features not available on other devices using those same apps.