On Tuesday, September 17th, 2019, Steam is receiving some new, exciting functionality for the Steam Library system. All players will be able to opt-in and try these new features, to deliver new organization to their Steam library. The Steam library will have a new visual layout, so you can see your games in an all-new way. You will also be able to see what your friends are playing and be able to see events for your actively played games in an easier fashion. Further details and visuals can be found on Steam.
Developers will also have some new features and tools to take advantage of to make Events and Announcements on Steam, and more information can be found about that here.