Xbox boss Phil Spencer says that work on bringing Activision Blizzard's back catalog to Game Pass started only recently, owing to how long the acquisition's approval process took.
Warhammer 40,000: Darktide (for console and cloud) and From Space are also joining the service's catalog in the coming days.
Jim Ryan also says that with nearly 50 million PlayStation Plus subscribers, Sony has a more "meaningful" service than Game Pass.
"We believe it is important to provide services that are recognized as being of sufficient value even if prices are increased," the head of Xbox says.
If Game Pass doesn't see enough growth outside of consoles in the coming years, Microsoft might not stick around in the games industry.
COCOON, The Lamplighters League, and Party Animals are also set to join the service's catalog in the coming days.
Its library will include the likes of Gears 5, Fallout 4, Forza Horizon 4, Inside, Stardew Valley, and many others, with updates coming 2-3 times per year.
Meanwhile, Heart Machine and Annapurna Interactive's action platformer Solar Ash will also be joining Game Pass.
Developer Jump Over the Age has confirmed that like is predecessor, Citizen Sleeper 2: Starward Vector will launch day one on Game Pass.
Over the coming days, Game Pass subscribers will also get access to acclaimed indie titles Firewatch and Gris.
New and lapsed subscribers could previously purchase a 1-month subscription for just $1, though that period has now been reduced to two weeks.
Blizzard Entertainment president Mike Ybarra has quashed recent rumours that the action RPG is headed to Game Pass.
Returning subscribers with expired subscriptions and new subscribers can once again join in for an introductory $1 price.
Sports Interactive studio head Miles Jacobson doesn't agree with PlayStation CEO Jim Ryan that Game Pass is "value-destructive."
F.I.S.T.: Forged in Shadow Torch is finally come to Xbox, while the new Game Pass lineup also includes The Bookwalker, Bramble: The Mountain King, and more.
Techonica, Little Kitty Big City, The Bookwalker, The Wandering Village, Mineko's Night Market, and more also confirmed.
Persona 5 Tactics is a turn-based tactics spinoff of Atlus' beloved RPG series and is due out in November this year.
The long-rumoured ground-up remake of Persona 3 has been officially unveiled at the Xbox Games Showcase.
A ground-up remake of Persona 3, Persona 3 Reloaded looks set to be officially unveiled at the upcoming Xbox Games Showcase.
The likes of Stacking, Rune Factory 4 Special, Chicory: A Colorful Tale, Hypnospace Outlaw, and more are also coming to the service.
