Subnautica Below Zero

Subnautica: Below Zero is an upcoming game that acts as an expansion to the story of Subnautica. The full release date is currently planned for sometime in 2019, with early access coming sometime in late 2018. Below Zero will be purchased separately, and as such will not require the original game to play. The Arctic will be the setting of the story, which will feature a new protagonist rather than Ryley Robinson, and takes place in a different map in a time after Ryley Robinson has escaped Planet 4546B.

Confirmed Features
Features that have been confirmed through various means.
 * Arctic Kelp Forest
 * Arctic Kelp
 * Arctic Mega Biome
 * Arctic Spires
 * Brute Shark
 * Glow Whale
 * Snowfox
 * Hoverpad
 * Jukebox
 * Lily Paddler
 * New protagonist
 * Penguin-like creature
 * Pinnicarid
 * Sea Truck
 * Spike Trap
 * Squidshark
 * Symbiote
 * The Vesper
 * Thermal Lily
 * Thermal Zone
 * Titan Holefish
 * Twisty Bridges
 * Weather System

Potential Features
Features that the developers are still experimenting with that may not end up in the final build.
 * Bloom Plankton
 * Hot Springs area
 * Large Bird
 * Rock Puncher

Trivia

 * With the exception of the Prawn Suit, Subnautica's vehicles are unlikely to appear in this game.