It seems Microsoft will be keeping their focus on Creators for their next version of Windows 10. After the Creators Update in March 2017 and the Fall Creators Update in September 2017, it appears the next major update to Windows 10 is set to be called the Spring Creators Update.
The name was leaked as part of the Windows 10 February 2018 Bug Bash, as captured by this screenshot by Richard Hay.
The update is set to bring more fluent design to the OS, move more settings from the Control Panel to the modern Settings UI and bring Timeline, which is the biggest change so far in how Microsoft expects users to be productive on the OS, and much more.
Like the first Creators Update, the (actual second) Spring Creators Update is expected around March 2018.