The other three content updates are planned to arrive before the end of 2018. Each update will be free for all "Sea of Thieves" players.
When it releases in early May, The Hungering Deep will feature a new enemy which crews will need to discover and defeat as part of a unique event.
Beyond that, there are two more major content updates slated to make its way to the game in the summer titled, Cursed Sails and Forsaken Shores, which also carry new AI hazards, gameplay mechanics, as well as rewards.
"Sea of Thieves is a unique experience", said Executive Producer Joe Neate.
The game has been out for a few weeks now, and based on the feedback I've been hearing, Sea of Thieves has been just a little bit light on stuff to actually do.
The studio discusses its content plans in depth in the developer video below.
Also in May, the game will see the introduction of weekly events, where various new mechanics to play around with as well as goals to achieve will be rotating on a weekly basis.
Rare is also planning weekly events that offer new challenges and time-limited exclusive rewards, like hidden treasure, for exploring the world. The former is expected to introduce a new ship type and the latter will open the map up even further, revealing a new perilous part of the world to set sail to.
From the sounds of it, weekly events seem like Rare is going to be both adding new things to the game and building upon what they've already got in the core game. Whether you're adventuring as a group or sailing solo, you're bound to encounter other crews in this shared-world adventure game - but will they be friends or foes, and how will you respond? Expect our plans to continue to be fluid but always with the goals listed above as our guiding principles.
All of the aforementioned content will be available to Sea of Thieves players at no additional cost.