The Somnium Space roadmap is a great way to follow along with the progress of the Somnium Space project. Hosted on canny, it keeps the community up to date with a comprehensive list of what the development team is currently working on, broken down into 3 sections: PLANNED, IN PROGRESS & COMPLETE.

Click to view the official Somnium Space roadmap

Upcoming developments include the ability to build underwater, teleporter integration, the Unity SDK and much more.

Also, Somnium Space has produced an Economy Paper, which is more like a collection of ideas formed as a presentation outlining the vision that the team have for the project, and what they are aiming to do, at some point.

A good way to follow progress and new releases is by following the official Somnium Space twitter account.