Currently all mobs and equipment items are usable, allowing you to create your own world using both World Editor and the Ring. Player actions and materials are not yet available and still in the works.
I'm following this project for a while and I had tears in my eyes seeing (a more or less empty) ring shard working on my own machine! I miss this game mechanic so much and I am very thankful to all the people involved who fixed the many issues this project had.
I hope to see some of these mechanics return to the main game again, esp. for roleplay and / or events this could add some excitement granted the tools and shard is stable with a larger group of players.
I'm excited for Ryzom to see so many new projects appearing, interest in the game is still strong.