This is the full list of upcoming Xbox One console exclusives (Defined as: games that are only available on the Xbox One and PC)

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Air Missions: HIND (6/14/17) §†
Cuphead (9/29/17) §
Forza Motorsport 7 (10/3/17)
Crackdown 3 (11/7/17)
The Adventure Pals (2017)
Anamorphine (2017) §
The Artful Escape of Francis Vendetti (2017) §
Ashen (2017)
Beacon (2017)
Beat the Game (2017) §
Book of Demons (2017) §†
Crash Force (2017) §†
Deadbeat Heroes (2017)
Full Metal Furies (2017) §
Glitchrunners (2017) §†
Graveyard Keeper (2017) §
The Last Night (2017) §†
Monster Buster: Agency (2017) §
Ooblets (2017) §
Outward - The Adventurer Life Sim (2017)
Phantasmal: City of Darkness (2017) §†
Reservoir Dogs: Bloody Days (2017) §†
Sombrero (2017) §†
Swordy (2017) §†
Aftercharge (2018) §
The Darwin Project (2018)
Deep Rock Galactic (2018) §
Starpoint Gemini: Warlords (2018) §†
Astroneer (Early Access) §†
The Culling (Early Access) §†
Gigantic (Early Access)
Pit People (Early Access) §†
AE Lucky Fishing (TBA)
Calibre 10 Racing Series (TBA) §†
Chuck's Challenge 3D (TBA) §†
Elementales (TBA)
ENKI (TBA) §†
Gemini - A Tale of Two Stars (TBA)
Happy Dou Dizhu (TBA)
Happy Mahjong (TBA)
I'm MT 2 (TBA)
Ori and the Will of the Wisps (TBA)
The Toilet Chronicles (TBA)

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§ Denotes games that already have a Steam page
† Denotes games that have already been released on Steam.