This is just a basic summing up of the 36+ page mega wishlist thread.
This way you dont have to read all the pages of post to see if your idea hs been talked about yet.
This is work in progress...
I cut/pasted and edited for clarity. I dont take credit for all these ideas and hope that ofp2 is a great game!
-- Most important
NO RUSH! NO RUSH! NO RUSH! NO RUSH! Take your time and get the game  mostly right the first release
-- Engine
TK punishment
Better sound effects
Better AI (who make their own decisions)
Decent collision detection
Fix the building clipping problems and collision detection
JOIN GAME IN PROGRESS
Buildings that crumble, not deflate
No more islands. Wide open spaces that we could drive for half an hour and not reach the end of.
Better netcode
Ingame menus better
Real ballistic for bullets
Explosions...Explosions!...EXPLOSIONS!
More than one joystick; and an easy to control configuration screen.
-- Tools for missions and mods
A real object oriented script language
*Integrated text editor in the mission editor (for script editing).
*Debugger
*Command line parser within the actual game
*Real dynamic creation of objects (instead of the current camCreate)
*Real-time programming features like threadsafe, semaphores etc.
*Exception handling
List with all the commands
Easy to use mission editor
Easy to use terrain editor/creator
Easier implementation and removal of mods that doesn’t require uninstall/reinstall and reformat
-- Environment
I'd really like to see big islands that feel more realistic. Take the airports we have now, for example. No control tower or hangars or anything that can really be called a terminal building. No wrap around perimeter fence. They just don't "feel" right, you know?
Better tree destruction. For example, if you shoot at a tree half way up the trunk with a .50 cal MG, the tree will break in half
Hand signals
Better atmospheric conditions, real rain, snow etc
Better civilians, like women and children
More varied surroundings
Real water, creeks and rivers and ponds, ability to cross water on foot(swim) without dying.
Terrain and weather improvements like grassy areas more rained stuff.
Better environmental sounds, like very long realistic sounding loop that blend with where you are. (ie near a creek you hear running water, forest you hear squirrels and birds, meadows you hear a slight breeze, and grass swaying, and different sounds at night (crickets)
-- Infantry
AI that can use Bunkers and does not go prone in them when the enemy approaches
The ability to 'run' while crouched, like keeping your head down.
High poly Infantry models, including chinstraps on helmets, better equipment detail on load bearing vest/harness (optimally you’d see what the character is actually equipped with, example: number of hand grenades,  nvg, magazine pouches), Rucksacks for all (to increase equipment that can be carried, could be handled similar to storage boxes).
Smoother, more realistic movement
Some sort of jump; mainly to get over obstructions and not to dodge fire.
Bayonets on the rifles for when you don't have any ammo left
Ability to get up and down faster for quick movement
Inventory overhaul: like why should the amount of LAW's affects to number of hand grenades?
Realistic ammo loads/specs for the weapons
Ability to dig in
Peek/lean movements to look round corners/objects
Delay grenades and flash bangs
Jamming, weapons should jam at times, forcing you to remove the magazine, replace it, reload.
-- Land Vehicles
A MG of top of tanks that can be manned by tank commander
Vehicles that aren’t made to traverse water don't blow up when they go in it. Engine dies and the vehicle will be stuck
Better damage modeling, both visually and physically, for vehicles
No bouncing jeeps, or bouncing tanks, or bouncing planes etc...
No more bouncing vehicles.
Better vehicle crash physics
Real driving models
Shooting while riding in vehicles
An artillery system that works
-- Air Vehicles
Would be nice to have real Laser pointers in planes, when you use laser bombs. If there are no laser pointer from the ground you must do it manually and point from the cockpit
Real flight models
Higher altitude
Mini guns for the helicopter door gunners
-- Command structure
A revised and tweaked command system that would give greater control: including large groups of units