what i would like to see in arma 3 is
More Customization
Face paint etc
Customizing outfits or weapons
Customizing own scope interface (red dot sight)
More animals
Agressive animals like lions that attack you or sharks unerwater
Enviroment
Things like water that rises higher at some points of the day,
Maybe storms that will affect bullet travelling (also add windmeters)
Radiation areas (radiation suits)
Fixing grass that blocks your view while prone
Personal stuff & animations
People that are sweating in hot climates,
Plindness by lights or lasers (also add lasers that are visible at daylight)
More body animations (like the sitting or surrender in arma 2)
Fun stuff/weird stuff
arma is an great game and playing it tactical and serious is its main purpose but maybe some fun stuff or onrealistic stuff is also nice,
things like alien ships or guns, just for a little bit fun, sure this should be turned off in most games.
Water pistol
Weapons
Electrical weapons like stun guns
Chemical weapons: gas bombs, gas grenades, hazmat suits, gas masks, deadly gasses
Melee weapons: Police sticks, knifes
Thermonucleair warfare
Some kind of protorype laser weapon or rail gun
Electric rifles: weapons that need power to fire bullets, they dont have much recoil and dont make much sound (stun guns but real rifles that use power instead of gunpowder)
Vehicles
Fire truck (with an water cannon that works)
