Donya: “Hello Subnauts, A few of you noticed some information shared online by our publisher, KRAFTON While some of the news is exciting, wed like to clarify:
– Early Access is not intended for release in 2024, but we plan to share a lot more information later this year!
– In reference to Games-as-a-Service, we simply plan to continually update the game for many years to come, just like the previous two Subnautica games. Think our Early Access update model, expanded. No season passes. No battle passes. No subscription.
– The game is not multiplayer-focused. Co-op will be an entirely optional way to play the game. Youll be able to enjoy the game as a single-player.”

Source: N4G PC An Update About the Next Subnautica