Valve will be releasing several major Steam updates in 2019. The updates include a new game library user interface and improved game streaming functionality.
The most significant change listed in the recent announcement is the upcoming game library user interface redesign. The redesign has been in development for several years.
Valve is currently also working on updating Steam's store recommendation algorithms, reworking Steam TV to support all games instead of just tournaments, reworking Steam Trust to work with all games instead of just Counter-Strike: Global Offensive, and updating its PC Cafe Program.
Steam Trust will become a full Steam feature that will be available to all games. This means players will have more information that they can use to help determine how likely a player is a cheater or not.
In addition, Steam will also be getting a reworked events system, enabling players to highlight interesting activities in their games like tournaments, streams, or weekly challenges.
The Steam store and client will also be making its way to mainland China this year. Valve has partnered with Chinese publisher Perfect World for its release.
The release date for these Steam changes was not provided.