Here is the quick breakdown:

    Essential ($9.99 per month) – Replacing Core, no price increase
        Over 50 Games
        Now playable on PC, console, and cloud
        Unlimited cloud gaming
        In-game benefits, including for Riot Games
        Online console multiplayer
        Play and earn up to $25 a year in the Store with Rewards
    Premium ($14.99 per month) – Replacing Standard, no price increase
        Over 200 games
        Now playable on PC, console, and cloud
        New Xbox published games within a year of launch (excludes Call of Duty titles)
        Unlimited cloud gaming with shorter wait times
        In-game benefits, including for Riot Games
        Online console multiplayer
        Play and earn up to $50 a year in the Store with Rewards
    Ultimate ($29.99 per month) – Price increased by 50 percent from $19.99 per month
        Over 400 games
        Playable on PC, console, and cloud
        Over 75 day one games a year, including all Xbox published games day one
        Ubisoft+ Classics and EA Play included, with Fortnite Crew coming in November (requires Game Pass Ultimate)
        Unlimited cloud gaming at our best quality with the shortest wait times.
        In-game benefits, including for Riot Games
        Online console multiplayer
        Play and earn up to $100 a year in the Store with Rewards
    PC Game Pass ($16.49 per month) – Prince increased by 40 percent from $11.99 per month
        Same features as before / no upgrades

Microsoft Gaming also announced the following game additions to each plan, starting today:

    Ultimate
        Assassin's Creed II (PC)
        Assassin's Creed III Remastered (Cloud, PC, and Console)
        Assassin's Creed IV Black Flag (Cloud, PC, and Console)
        Assassin's Creed IV Black Flag: Freedom Cry (PC)
        Assassin's Creed Brotherhood (PC)
        Assassin's Creed Chronicles: China (Cloud, PC, and Console)
        Assassin's Creed Chronicles: India (Cloud, PC, and Console)
        Assassin's Creed Chronicles: Russia (Cloud, PC, and Console)
        Assassin's Creed Liberation HD (PC)
        Assassin's Creed Revelations (PC)
        Assassin's Creed Rogue Remastered (Cloud, PC, and Console)
        Assassin's Creed Syndicate (Cloud, PC, and Console)
        Assassin's Creed The Ezio Collection (Cloud and Console)
        Assassin's Creed Unity (Cloud, PC, and Console)
        Child of Light (Cloud, PC, and Console)
        Far Cry 3 (Cloud, PC, and Console)
        Far Cry 3 Blood Dragon (Cloud, PC, and Console)
        Far Cry Primal (Cloud, PC, and Console)
        Hogwarts Legacy (Cloud, PC, and Console)
        Hungry Shark World (Cloud, PC, and Console)
        Monopoly Madness (Cloud, PC, and Console)
        Monopoly 2024 (Cloud, PC, and Console)
        OddBallers (Cloud, PC, and Console)
        Prince of Persia The Lost Crown (Cloud, PC, and Console)
        Rabbids Invasion: The Interactive TV Show (Cloud and Console)
        Rabbids: Party of Legends (Cloud, PC, and Console)
        Rayman Legends (Cloud, PC, and Console)
        Risk Urban Assault (Cloud and Console)
        Scott Pilgrim vs. The World: The Game (Cloud, PC, and Console)
        Skull and Bones (Cloud, PC, and Xbox Series X|S)
        South Park: The Stick of Truth (Cloud, PC, and Console)
        Starlink: Battle for Atlas (Cloud, PC, and Console)
        Steep (Cloud, PC, and Console)
        The Crew 2 (Cloud, PC, and Console)
        The Settlers: New Allies (Cloud, PC, and Console)
        Tom Clancy's Ghost Recon Breakpoint (Cloud, PC, and Console)
        Tom Clancy's Rainbow Six Extraction (Cloud, PC, and Console)
        Tom Clancy's The Division (Cloud, PC, and Console)
        Trackmania Turbo (Cloud, PC, and Console)
        Transference (Cloud and Console)
        Trials Fusion (Cloud, PC, and Console)
        Trials of the Blood Dragon (Cloud, PC, and Console)
        Trials Rising (Cloud, PC, and Console)
        Uno (Cloud, PC, and Console)
        Valiant Hearts: The Great War (Cloud, PC, and Console)
        Watch_Dogs (Cloud, PC, and Console)
        Wheel of Fortune (Cloud and Console)
        Zombi (Cloud, PC, and Console)
    Premium (also in Ultimate)
        9 Kings (Game Preview) (PC)
        Abiotic Factor (Cloud, PC, and Xbox Series X|S)
        Against the Storm (Cloud, PC, and Console)
        Age of Empires: Definitive Edition (PC)
        Age of Empires III: Definitive Edition (PC)
        Age of Mythology: Retold (Cloud, PC, and Xbox Series X|S)
        Ara: History Untold (PC)
        Arx Fatalis (PC)
        Back to the Dawn (Cloud, PC, and Console)
        Battletech (PC)
        Blacksmith Master (Game Preview) (PC)
        Cataclismo (PC)
        Cities: Skylines II (PC)
        Crime Scene Cleaner (Cloud, PC, and Xbox Series X|S)
        Deep Rock Galactic: Survivor (Cloud, PC, and Xbox Series X|S)
        Diablo (PC)
        Diablo IV (PC and Console)
        An Elder Scrolls Legends: Battlespire (PC)
        The Elder Scrolls Adventures: Redguard (PC)
        Fallout (PC)
        Fallout 2 (PC)
        Fallout: Tactics (PC)
        Football Manager 2024 (PC)
        Frostpunk 2 (Cloud, PC, and Xbox Series X|S)
        Halo: Spartan Strike (PC)
        Hogwarts Legacy (Cloud, PC, and Console)
        Manor Lords (Game Preview) (PC)
        Minami Lane (Cloud, PC, and Console)
        Minecraft: Java Edition (PC)
        Mullet MadJack (Cloud, PC, and Xbox Series X|S)
        My Friendly Neighborhood (Cloud, PC, and Console)
        One Lonely Outpost (Cloud, PC, and Console)
        Quake 4 (PC)
        Quake III Arena (PC)
        Return to Castle Wolfenstein (PC)
        Rise of Nations: Extended Edition (PC)
        Senua's Saga: Hellblade 2 (Cloud, PC, and Xbox Series X|S)
        Sworn (Cloud, PC, and Xbox Series X|S)
        Terra Invicta (Game Preview) (PC)
        Volcano Princess (Cloud, PC, and Console)
        Warcraft I: Remastered (PC)
        Warcraft II: Remastered (PC)
        Warcraft III: Reforged (PC)
        Wolfenstein 3D (PC)
    Essential (also in Ultimate and Premium)
        Cities: Skylines Remastered (Cloud and Xbox Series X|S)
        Disney Dreamlight Valley (Cloud, PC, and Console)
        Hades (Cloud, PC, and Console)
        Warhammer 40,000 Darktide (Cloud, PC, and Console)