I will answer these as best as I can from what I know so far (no, I’m not 343i employee).
Will Halo 4 have Multiplayer? - StalkerUKCG
Will Halo 4 Have a Competitive Ranking System? - Blissful
BR - 5 shot? DMR - 4 shot? Please elaborate. - UNKNOWN iXi
BR is 5sk as of RTX. DMR is 5sk as of RTX.
Custom Loadouts: Will anything be banned from Matchmaking? (ie: If we choose all Jetpacks in our Custom Loadouts, what would happen if you were to ban Jetpacks?) - UNKNOWN iXi
Will the secondary weapon be outlined in the HUD? - UNKNOWN iXi
Will the Mammoth be in Multiplayer? - Dug
N/A (But it better be!)
Will the infamous GRD helmet make an appearance? - DeadNames
More than likely.
How do vehicle physics and health behave differently compared to previous Halos (specifically, compared to Reach)? - Anonymous 1
More like Reach’s, but not nearly as bad.
Is Jetpack a choice for your Matchmaking loadout and has it changed since Reach? - PirateKing526
Will the majority of playlists be Infinity Slayer based or Team Slayer based? - Ghouse
Will we have another playable melee weapon other than the sword in Halo 4? Maybe a Promethean Melee Weapon? - Anonymous 2
Are Forge pallets specific to certain maps or available between all Forge maps? - BET
Can we expect any maps smaller than what we’ve seen so far? - BET
No. Wraparound and Adrift are the smallest maps.
How many Primary Weapons can we expect? - BET
Will Forge have a plethora of lighting items/orbs? - BET
Will the player investment system be on the more finite side, similar to Halo 3, or more like a Halo Reach/Call of Duty hybrid, with “challenges”? - Anonymous 3
XP ranks you up. Challenges give you more XP. You buy stuff with Spartan Points. You get Spartan Points every time you rank up. Ranking up automatically gives you new armor.
Will community maps be betterly implemented, or given a separate playlist in Halo 4? - coca mola
Is the Light Rifle a loadout weapon? - Monsterfracas
Will there be Hunters in Campaign/Spartans Ops? - Deadly Paw
N/A (But I’m betting on Yes)
Will the ranking system take account of not only performance, but actually winning the game? - Anonymous 4
Since Halo: Reach, a good portion of the community is apprehensive about Armor Abilities being in Halo 4 at all, now you’re adding Specializations and Armor Mods. What would you say to alleviate some of our fears? - PirateKing526
Can we get a confirmation on the Mark V helmet returning? - Anonymous 5
Will any of the past Halo characters make an appearance in Halo 4 (e.g.- Sergeant Johnson), whether in voice-overs or physical appearance? - Yo-Yo Mama
Master Chief and Cortana.
Will we see “classic” playlists again? as in gametypes without armor abilities, just good old fashioned halo 1/2/3 play? - Secretanchitman
Will custom challenges return? - Anonymous 6
N/A (However, Challenges are back, so I wouldn’t be surprised if CC are back)
What variations of the Warthog can we expect to be in Halo 4, and will they all be available in Multiplayer/Forge? The Troop Warthog would be a great addition to the Forge and Machinima sandbox. - Voho
Why can’t i get an Overkill - Tashi
That’s something you have to ask yourself.
Will the framerate be locked for the first time ever in a Halo? - Anonymous 7
Will Forge maps have a map preview feature? - Anonymous 8
N/A (However, this was going to be added in Reach before time ran out)
Will there be more secondary loadout weapons? - Joseph007DJ
Is flag juggling in? - JackHerer
How will drop-in/drop-out gameplay work? Will it be in “social” playlists only? - The Blibinator
Will we be able to assassinate players who are assassinating another player (as an effective method of stopping an assassination)? - SENSEI ASAD
In Reach, you were able to see your cR breakdown at the end of the match, but this was removed for split-screen, so none of the players were able to see how much cR they earned. Will this be fixed for Halo 4? - SENSEI ASAD
Is re-enlisting for Specializations similar to that of the CoD prestige system? - The Dildozer
Will Stalker be banned from Halo 4 matchmaking for having such as stupid idea with this document? -Gui
Why has the DMR Clip size been reduced to 14. Wouldn’t it be better to have it stay 15 and buff the BR to have a 45 round clip size? - sg1Elim89
It is 14. I don’t know why however.
Will power ups be added to the “Standard slayer experience?” - sIttIng mambaa
Are classic sentinels back? -sIttIng mambaa
N/A (But if Sentinels aren’t back, on a Forerunner installation, in a Shield World, protecting stuff, somebody messed up)
Is the mech playable in MP? -sIttIng mambaa
N/A (I have heard a smaller mech is available in Multiplayer)
Can we get more information on this mech/walker? -M0aHerder
Yes. On November 6, 2012.
Will we be able to drive the Mammoth? -M0aHerder
Sentinel Beam-like weapon? -M0aHerder
Will the Pelican be flyable at any point? -M0aHerder
Hope I answered simply, and hope some of you got happy.