The Subnautica: Below Zero rating by ESRB indicates that the sequel to Subnautica is coming to Xbox One, Xbox Series, PS4, and PS5 consoles too, not just Switch.
Back in August 2020, Nintendo have announced that both Subnautica and Subnautica: Below Zero are coming to their Switch console sometime in 2021.
According to the recent ESRB rating (Entertainment Software Rating Board), Subnautica: Below Zero is now coming to all platforms, which means Windows PC, PlayStation 4, PlayStation 5, Nintendo Switch, Xbox One, Xbox Series are all getting the sequel to Subnautica survival hit game.
The game was rated E10+ (Everyone 10+) which means that the in-game content is suitable for persons of age 10 and older. Here's the official rating summary from their website:
This is an adventure game in which players assume the role of an explorer (Robin Ayou) on a mysterious planet. From a first-person perspective, players search for clues about a family member, craft tools, build habitats, and defend themselves against predatory alien creatures. Small creatures may attack players if provoked; larger creatures can strike or bite players, causing Robin to cry out in pain. A mechanical suit with tools allows players to grab enemies and incapacitate them; aliens sometimes emit splatters of yellow liquid when hit. The words “damn” and “hell” appear in the dialogue.
Subnautica: Below Zero is a game in development by Unknown Worlds Entertainment that acts as an expansion to the story of Subnautica. Early access was released on January 30, 2019. Below Zero is purchased separately, and as such does not require the original game to play.
The game is available on Steam, Epic Games, and the Discord Store. Sector Zero is the setting of the story, which features a new protagonist rather than Ryley Robinson, and takes place on a different map two years after Ryley Robinson has escaped Planet 4546B.
Sources: ESRB.org , subnautica-belowzero.fandom.com