Great news! We've finalized the roadmap for WebStorm 2020.1 and would love to learn what you think of it.
http://blog.jetbrains.com/webstorm/2019/12/webstorm-2020-1-roadmap/ …
Yes, all products have their roadmaps but not all teams share them publicly. Besides that, there's a platform-wide roadmap for all IntelliJ-based IDEs (see http://blog.jetbrains.com/idea/2019/12/intellij-platform-roadmap-for-2020/ … for more information).