System Era Softworks announced Astroneer Glitchwalkers is the first paid expansion for the game, with downloadable content adding a new planet, new biomes, new technology, new gameplay features, and the game's first true villain. It will be available on all platforms in 2024.
Here's an overview of the expansion via the Steam page:
About
Travel to the Aeolus system in pursuit of a great threat in Glitchwalkers.
Downloadable content “Glitchwalkers” is our first expansion Astroneeroffers new space to explore as well as new narrative, gameplay and secrets to unlock.
New Horizons Call
A brand new planet, Aeolus is our largest and most complex planet to date. New biomes and challenges await any Astroneer brave or foolish enough to set foot on this uncharted world.
Face a New Enemy
A rogue Astroneer infiltrated the system and took control, threatening any intruders who might interfere with this unprecedented power grab.
New Tech Tree, Modules and Gameplay
Astroneers must use their training and adapt quickly to dangerous new environments. Using a mix of new and old technology, they'll have to think on their feet just to survive.
Additional unannounced Content and Free Updates to the Base Game
In addition to the expansion, all players will continue to see story, gameplay and various improvements. Astroneer.
Astroneer Available now for PlayStation 4, Xbox One, Switch and PC via Steam.
Watch the announcement trailer below.