This topic is more complicated, as Assets/Content need time and resources, so I can understand if these will not be considered, but no harm in placing them here anyhow, especially as their additions could see Reforger then being "Content complete".

Kepp in mind that also I am not saying we should get all these in the same package, but at least some over some updates, or even a new post release Roadmap, in the lead up to finally wrapping up Reforger development and going all-in on Arma 4.

FIA:

Weapons:
Kozlice Shotgun/CZ-581
M1911 and/or CZ 75
CZ 550
Sa 25 Submachine Gun and/or Uzi Submachine Gun
AKM
AKMS
G3 and/or FN FAL

Vehicles:
Hilux Armed Offroad - MG and SPG-9 Variants
T-55 and/or T72A
Mi-8
V3S to replace the Ural Truck

Apparel:
Balaclavas:

Face Covers:

Miscellaneous:
Some randomization in headgear and clothes, to make them a bit more ragtag

Soviets:

Weapons:
9K38 Igla

Vehicles:
Mi-24 Hind
T-72A and/or T72B
BMP-2
BM-21 Grad
9P117 SCUD-B
Mikoyan MiG-29
Antonov An-22

Apparel:
Head Bandana's for Soviet Spetznatz

US/NATO:

Weapons:
FIM-92 Stinger
MP5 and MP5-SD Submachine Gun
M24 Sniper Rifle/Remington Model 700

Vehicles
AH-64 Apache and/or AH-Cobra
CH-47D Chinook
M1 Abrams
Bradley Fighting Vehicle
AAV-7A1 Amphibious Vehicle
MLRS Launcher
F-15 Eagle
C-130 Hercules

Civilian:

Vehicles:
Civilian versions of the Mi-8, used for Search and Rescue/Fire Fighting
Tractor
Civilian Hilux Offroad
Land Rover Defender

Apparel:
Longcoat (maybe even longcoats for Officers of the Soviets and NATO)
Tank-Top, with striped variants for different branches of the Soviet military
Tracksuits
Berets for all Factions:

Miscellaneous:
More civilian gear in the form of uniforms for Police, and a police car, and for fire fighters.
General:

1. New heads for both NATO and Soviet forces, that have camo on them, could be useful for special forces units
2. Some form of boat/boats, considering we are on Islands
3. A version of the S105 car, with darkened glass and higher armor, intended as a VIP Vehicle
4. Some Headphones/Headsets, that could be combined with some headgear and as standalone items to wear
5. Gillie Suits, that are very effective against the AI from Far to Medium range, and if you are still, short range, even to the point where in certain circumstances they can walk right beside you and not notice you

Large Content:
So this sections contents would definitely require resources and time to make, so I would not be surprised if little or none of this is added

1. Kolgujev, a dreary island filled with swamps, dead forests and abandoned and ruined villages.

Alongside introducing officially the "Wastelands" game mode (name placeholder) popularized in Arma 3, with 2 teams fighting over resources and equipment randomly generated across the map to destroy each other and hostile FIA forces

2. Nogova, a large and varied island, with a flatlands to the south and mountains to the north, with the capital city of Lipany situated at the south, and is a proper city, with any army planning to fight in it expecting Urban Warfare at its worst, with High rise Soviet Bloc apartments and large buildings near the center, surrounded by a quagmire of suburbs, it is a city and island dealing with the consequences of Guba's actions, and is being rebuilt with help of the West

Alongside introducing "Assault" game mode (name placeholder) where one side fights to conquer strategic areas across the map held by the AI opposing faction (both can be set in settings) and were each area taken has a QRF response to try and push them back, getting more intense as the fighting get closer to the AI HQ, once conquered, players win