1. Housing and Player-Driven Settlements:
The article mentions that Raph Koster's upcoming MMORPG sandbox, Playable Worlds, will feature a focus on housing and player-driven settlements. Players will have the ability to build and customize their own homes, potentially even entire towns or cities, which can serve as hubs for social interaction and community-building within the game world.

2. Planetary Governance and Political Systems:
The game is also set to explore the concept of planetary governance, where players will have the opportunity to participate in and shape the political systems that govern the various worlds within the game. This could involve forming alliances, establishing trade agreements, or even engaging in diplomatic conflicts with other player-driven factions or NPCs.

3. Language Systems and Multilingual Interactions:
One of the more intriguing aspects of Playable Worlds is its focus on language systems. The article suggests that the game will feature a multilingual approach, where players will need to learn and utilize different languages to communicate effectively with other characters, both NPC and player-controlled. This could add an extra layer of depth and realism to the game's social and political interactions.