Update 1/30: Subnautica: Below Zero is out now as an early access title.
Available on the Epic Games Store and Steam, Subnautica: Below Zero can be purchased for $20 USD.
The original story follows:
Subnautica is getting a sequel and it will be available as an Early Access title next week.
The news came via an announcement for the Subnautica Below Zero Early Access livestream, planned for January 30, 10AM PT/ 1PM ET/ 6PM GMT, which is when we’ll see the first trailer for the title.
Source: IGN.com Subnautica: Below Zero Out Now as Early Access Title