The guy says in a video that none of these are confirmed and possibly could never be added but…let’s be serious, if they are in the game somewhere the devs have obviously thought about adding these game modes.
Game modes mentioned
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Alpha Zombies
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Assault
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Attrition
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Banished Slayer
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Bastion
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Battle Royale
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Breakout
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Dominion
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Doubles
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Elimination
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Extraction
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Firefight
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Grifball
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Headhunters
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Gun game
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Holiday Fiesta
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Husky raid
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Infection
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Infinite Slayer
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Invasion
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King of the Hill
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Multi flag
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Multi bomb
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Neutral bomb
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Neutral flag
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one bomb
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one flag
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Regicide
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Ricochet
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Roaming King
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Rumble pit
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Rocket Race
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Score attack
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Super Fiesta
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Swat
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Territories
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two bomb
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two flag
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warzone
The biggest thing that jumps out to me is the Banished Slayer. Could this mean that there will possibly be playable covanent? This would go well with the possibility of Invasion.
If all of these game modes get added, this would be the biggest roster of game modes in any Halo ever If I am not mistaken.