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
Nope.
Will Halo 4 Have a Competitive Ranking System? - Blissful
Sorta.
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
N/A
Will the secondary weapon be outlined in the HUD? - UNKNOWN iXi
Yes.
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
Yes. N/A
Will the majority of playlists be Infinity Slayer based or Team Slayer based? - Ghouse
N/A
Will we have another playable melee weapon other than the sword in Halo 4? Maybe a Promethean Melee Weapon? - Anonymous 2
N/A
Are Forge pallets specific to certain maps or available between all Forge maps? - BET
N/A
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
14.
Will Forge have a plethora of lighting items/orbs? - BET
Yes.
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
N/A
Is the Light Rifle a loadout weapon? - Monsterfracas
Yes.
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
N/A
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
N/A
Can we get a confirmation on the Mark V helmet returning? - Anonymous 5
N/A
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
Yes.
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
N/A
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
N/A
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
Yes.
Is flag juggling in? - JackHerer
N/A
How will drop-in/drop-out gameplay work? Will it be in “social” playlists only? - The Blibinator
N/A
Will we be able to assassinate players who are assassinating another player (as an effective method of stopping an assassination)? - SENSEI ASAD
N/A
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
N/A
Is re-enlisting for Specializations similar to that of the CoD prestige system? - The Dildozer
N/A
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
N/A
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
N/A
Sentinel Beam-like weapon? -M0aHerder
N/A
Will the Pelican be flyable at any point? -M0aHerder
N/A
Hope I answered simply, and hope some of you got happy.