User blog comment:RougeLeviathan48/Things that I want in Subnautica (not an over-saturated topic at all)/@comment-26996876-20160513123051

1st thing, Multiplayer/Co-op Mode will not be implemented into this game. The devs have stated that it would be a separated Subnautica game. (similar to Don't Starve - single player - and Don't Starve Together  - multiplayer)

2nd thing, all Reefbacks will eventually live up to their name. This is an ongoing task, and in fact, a very tough one. The devs require more time to work on this.

Last thing, the Exosuit is coming. So, no new submersible for you.