A:IR Ascent: Infinite Realm
EU/NA Release : Unknown EU/NA release.

Ascent: Infinite Realm takes place in a high fantasy steampunk world where machines and magic rule and everyone is dependent on flight to explore, travel, and conquer. In search of a new home, adventurers take to the skies using a wide selection of airships, vehicles, and flying mounts to traverse A:IR’s open, highly vertical world.

Ashes of Creation
EU/NA Release : Unknown.

**Update** I’m now sceptical of the actually MMO being released now that they have release this battle royal style crap called Apocalypse** Origin : Ashes of Creation is a unique take on the MMO experience. Our world structure is dynamic and built to react to the actions of our players. Cities will rise and fall, their populations based on the history of the world as the players create it. Quests will unlock as these populations gather, their needs grow, and secrets are unlocked.

The Outer Worlds
EU/NA Release : 2020.

The Outer Worlds is a new single-player sci-fi RPG from Obsidian Entertainment and Private Division. As you explore a space colony, the character you decide to become will determine how this player-driven story unfolds. In the corporate equation for the colony, you are the unplanned variable.

Lost ARK World
EU/NA Release : EU/NA release Unknown.

Lost Ark, a 3D massively-multiplayer online role-playing game offers an immersive action-centric playing style and adopts a non-targeting combat system and a dynamic quarter-view angle to maximize the game experience. 
 
The whole world is in chaos from the attack of Kazeros’ demon army, as Kazeros opens the Chaos Gate with his six legions to invade the human world. Like a legend that exists in myths, the world has become a place where there are no heroes and everyone has forgotten about the Ark that defeated the demons in the past. Now, the player must venture the vast world of the Lost Ark and go against the demon army.
Dual Universe
EU/NA Release : 2020 unconfirmed.
 
Dual Universe is a “Boundless MMO”: based on an innovative server technology called CSSC (Continuous Single­Shard Cluster), the game enables everybody to play in the same world, at the same time, without any slicing of the game universe into instances or zones.

 The in-game world is entirely modifiable and an unlimited number of players will be free to build together, cooperate or compete. Using the building blocks provided by the game, the in-­game community will make the choices and create the content they will play in. 
Moonlight Blade
EU/NA Release : unconfirmed,
currently NON-ENGLISH

  
Moonlight Blade is a martial arts MMORPG set in an enormous ancient world. Follow the path of one of eight clans.  An enormous world 18 times bigger than Skyrim, and constructed with the aid of movie makers to create a cinematic combat experience.

 Experience questing, daily role-playing , or meditating under an instructor. Or, explore the world. 

Beyond traditional MMORPG elements, players can undertake assassination missions, play music, create ink paintings, and hunt on horseback. 

There are now 2,200 different types of plants designed, with 17 different environment designs. 
New World
EU/NA Release :  2019-2020, unknown.
  
New World is a massively multiplayer, open-ended sandbox game that allows you to carve your own destiny with other players in a living, hostile, cursed land. How you play, what you do, and whom you work with or against is up to you.  

Live on your own amidst the supernatural terrors or join with others to build thriving civilizations. In this evolving world that transforms with the changing of the seasons, weather, and time of day, the only limit is your own ambition.  

Note : Amazon have been leeching devs from Guild Wars 2 over the years.