Campaign
More of a free roaming aspect kinda like Crysis 3, still linear but tons of options. No more quick time events, at least where it’s not needed or something better can be in its place so no more replacing what could’ve been a bad -Yoink- boss battle with some boring, immersion killing QTE.
Findable skulls,Terminals and PDAs that lead to unlocking achievements, armor, and skins. Terminals should be viewable through the game and NOT just Waypoint. New comers to the series should be able to have at least a basic understanding of what the flock is happening without touching a prior Halo game or the Terminals.
More variety in enemies, less buttons being pressed, less Sarah Palmer, more variety in environments, and more weapons/vehicles/abilities being introduced throughout the campaign.
Matchmaking
Social, Ranked and Cooperative playlists. 24 players.
Custom Games
All custom gametypes and options from previous games with tons of options added on like ‘Instant Infection’ in Flood where you get Infected and instead of respawning you instantly turn into a Zombie on the spot.
Custom Games browser…
Forge
Return Fine Edit mode, return zooming with the monitor, add a dynamic lighting button in the Start menu instead of it generating everytime you exit forge mode and return the more used pieces in Halo 3 with a ton of new objects to play with.
The ability to add forge pieces, vehicles, weapons and all that ish through DLC. One forge map that’s the original Forge World but greatly expanded with a snow capped mountain, luxurious beach, Sandtrap style desert, and a huge flocking cavern connecting them all. CUSTOM POWERUP!
(Stuff that probably wouldn’t happen)
Forgable water, custom weather effects, customizable day/night cycle, paint tool, text tool, particle effect tool, and custom aesthetics on vehicles, weapons, and certain blocks.
Firefight
Removal of the Set system, larger maps with 6 to 8 players, and a dynamic enemy spawning system in which certain enemies will spawn depending on what you’re doing, so if you’re sniping from a distance Wraiths, Jackal Snipers, and flying enemies will be spawned.
If the enemy AI is improved and setting the difficultly on Heroic isn’t trivial like it is in Halo 4 then a possible fortification system could be added along with the ability to earn points and spend them on buying vehicles, weapons, abilities, and upgrades.
Theater
Support for Firefight and Campaign. Depth of field and if possible a custom FX thing that allows you to put certain effects on to get a sick screenshot. The ability to go into slow motion as well as rewind with sound effects that do the same. Adjustable zoom.
The ability to view other players in first person and have multiple different view modes that allow you to watch multiple players at once. Overhead views that point out weapons and their spawn times (optional of course), and finally a theatrical view mode for machinimas!
Challenges, Commendation, and Service Record
More unique challenges, a challenge counter and a monthly challenge that’s completely unique everytime and may call for the entire community to reach one goal, those who participate will be rewared with exclusive weapon/armor skins and emblems.
More rewards for finishing Commendations, for example: By finishing the Plasma Pistol Mastery Commendation by getting 100 kills and 1000 EMP Assists with the Plasma Pistol you get the Plasma Pistol emblem foreground and the EMP emblem background as well as a skin for the weapon you’ve mastered.
The service record shows the Legacy stats which are your stats in previous Halo games. The service record also shows commendation completion percentage and challenges completed as well as the amount of downloads and the average rating you get on your files.
Loadouts, Armor, and Spartan ID
Custom Loadouts appear in most of the Social playlists. No more Plasma Pistol, Boltshot, Plasma Grenades, Active Camo, Promethean Vision, or Jetpack in your loadouts. Most if not all Tactical Packages and Support Upgrades removed.
Return classics such as Mark V, ODST and CQB. You can have your visorless helmets that either look like Isaac Clarke, a Big Daddy or Squidwards house as long as I have my Mark V. Reach customization options pls.
Assassination weapons that don’t change gameplay but the animations that occur when Assassinating someone. Color Wheel, glossiness slider for the visor, customizable light colors with the return of the Armor Detail color option.
Return all emblems that can be returned and make them usable immediately, I shouldn’t have to unlock something I’ve been using for years. You can still change your stance but also now what weapon you’re carrying, these weapons are unlocked through completing the commendations for those weapons. There are weapons that you can use in your stance that are exclusive like a Halo 2 BR for playing H2 online.
Audio, Video, and Controller Settings
The ability to turn down different audio settings like Music, Sound Effects, Voice, Voice Chat, Announcer, and Sarah Palmers voice.
Customizable Y sensitivity. Customizable scoped sensitivity. The option to turn off aim acceleration and HuD movement.
File Browser
File rating system that goes from 0.5 Stars to 5 with the ability to search for files with a certain rating or in a certain range of ratings.
Automatic updates for things you’ve downloaded like Maps and Gametypes, when you get on the game they will automatically download which you can turn off so they can only be downloaded manually. With automatic updates you would no longer have to have 30 different versions of Simplex because there would only be one.
There could be a log of updates for each map/gametype in which a player can choose to revert back to an older version. If a mistake is made with an updated version of a file then the Author of the file can “Recall” the update so it will auto revert back to the last save for everyone.
Overall
More weapon variety like having a Hardlight Bow instead of a Binary Rifle and add the Sentinel Beam, Flamethrower, and the 4 different nade types again because those were the flocking ish.
Reach UI design. Remove Spartan Ops and have Campaign DLC. Less garbage medals (Generic Kill, Sniper Kill) with the return of the good ones (Sniper Spree, Sniper Headshot). Remove flinch and add descoping.