Believe it or not Halo 5 had a great setup/road map for its delivery of content simply being that content, no extra filler with cgi cut scenes or lore for why multiplayer has new content. There is zero pvp or story related activities in multiplayer so this continual push of telling “spartan stories” in multiplayer is a waste. There is no story, Halo Infinite is basically Halo 7 or 8, everything that could have been a side story was thrown out before even releasing the game. Halo 4 had Spartans ops because it tied into the campaign and it’s new characters we met.
Look at all past Halo’s and their use of expansions/content, they simply added new maps, modes, and in some armor to the game.
Simply put new content should be
-Maps
-Game modes
-New materials in forge when it exist
-Armor that is completely earnable (A progression system with ranks should be the main source and new armor can be linked to challenges that are always available)
-Battlepass that offers variation of that new/old armor ( such as everyone has standard Mk7 armor, but the store and BP offer that same armor being plasma damaged, covered in covenant blood, being broken and cracked in some areas and even new markings/decals)
The content can be random and does not need to match any sort or theme, like the past two seasons Halo Infinite barely had.
Look at MCC just simply adding armor because it is content.