New surprise addition, available today:

Grand Theft Auto V (X1)

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https://news.xbox.com/en-us/2020/01/03/available-today-with-xbox-game-pass-grand-theft-auto-v/

More games will be added soon. "Leaked" on the official Game Pass app.

Sword Art Online: Fatal Bullet (X1) - January 9th
Frostpunk: Console Edition (X1) - January 9th
Tekken 7 (X1) - January 16th

Now it's (even more) official. Furthermore Frostpunk will also be available on PC and FTL: Faster Than Light will be an exclusive PC addition "soon".

All aforementioned games (Tekken 7 excluded) are now available!

Quite a big update today.

Added to the GP library:

Tekken 7 [X1]
Children of Morta [X1, PC]

New upcoming games in January:

A Plague Tale: Innocence [PC]
Gris [PC]

More games that will be removed:

Middle-earth Shadow of Mordor GOTY
Resident Evil 4
Tom Clancy's The Division (1 1/2 months after they re-added it. wtf?)
Tomb Raider: Definitive Edition
Saints Row The Third

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No news about new X1 games so far, so the others might not be exclusive to PC.

Wow almost bought Plague when it was $20 on Amazon. Interested in Children of Morta as well. Downloading now.

Plague Tale is PC only?

at this point yes but only because we haven't seen any news about games coming to the Xbox One platform for the remainder of the month.
We might get info on that in a couple of hours or tomorrow at the latest.

Gris might be PC only though as that game doesn't have an Xbox version.

We finally got the news about the newest Game Pass games for console.

Arriving January 23

A Plague Tale: Innocence (Console and PC)
Hunted by Inquisition soldiers and surrounded by unstoppable swarms of rats, guide the young Amicia and her little brother Hugo through a brutal, unforgiving world as they struggle to survive against overwhelming odds. Developed by Asobo Studio, experience this acclaimed action adventure game as you journey through some of the darkest hours of history.

Indivisible
Immerse yourself in a fantastical world with dozens of playable characters, a rich storytelling experience, and gameplay that’s easy to learn but difficult to master. Play as a fearless girl named Ajna whose life is thrown into chaos when her home is attacked and a mysterious power awakens within her. With a huge fantasy world to explore and a variety of characters to meet and fight alongside of, help Ajna learn about herself and how to save her world.

Arriving January 30

Sea Salt (ID@Xbox) (Console and PC)
Sea Salt is an action strategy hybrid, in which you are an old god summoning unfathomable horrors to blight the human lands. By summoning a tide of minions, your army will emerge from the sea to take vengeance on the religious figures who have dared to defy you… and anyone else that stands in your way. You will have your sacrifice, and humanity will pay for denying you what you are owed.

Fishing Sim World: Pro Tour
Compete in an authentic career mode against over 100 pro anglers to become the best fisherman in the world. From Bass, Carp, and Predator fishing, play your way in custom multiplayer competition and online tournaments while using equipment from over 50 partners on real world venues targeting 29 different species of fish.

https://news.xbox.com/en-us/2020/01/22/coming-soon-xbox-game-pass-for-console-january-update/

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Game Pass for PC also sees previously unannounced games:

Coming Soon

A Plague Tale: Innocence
Hunted by Inquisition soldiers and surrounded by unstoppable swarms of rats, guide the young Amicia and her little brother Hugo through a brutal, unforgiving world as they struggle to survive against overwhelming odds. Developed by Asobo Studio, experience this acclaimed action adventure game as you journey through some of the darkest hours of history.

Gris (ID@Xbox)
Explore a meticulously designed world brought to life with delicate art, detailed animation, and an elegant original score where light puzzles, platforming sequences, and optional skill-based challenges will reveal themselves as the story unfolds, allowing Gris to see her world in a different way, unlocking new paths to explore using her new abilities.

ScourgeBringer (ID@Xbox)
With fluid control, aerial combat, pixel graphics and a punchy soundtrack ScourgeBringer aims to channel the mystery and rawness of an early rogue-platformer. Armed with a trusty combat drone, you must shoot and slash your way through the infinite depths of an ever-changing dungeon, wherein gigantic bosses, ancient machines, strange ghosts and untold secrets from previous explorers await.

Sea Salt (ID@Xbox)
Sea Salt is an action strategy hybrid, in which you are an old god summoning unfathomable horrors to blight the human lands. By summoning a tide of minions, your army will emerge from the sea to take vengeance on the religious figures who have dared to defy you… and anyone else that stands in your way. You will have your sacrifice, and humanity will pay for denying you what you are owed.

I feel kinda bad for the people who bought A Plague Tale: Innocence in the recent sale. Hope you can get a refund.

Definitely going to play that. Indivisible looks intersting as well.