Ok i have a small wish to add to the wishlist, I think ArmA as it is already has alot to offer, it's an amazing simulator, and covers alot of features to create your own variations on tactics on the same scene/mission. I think ArmA 3 is putting more emphasize on this guerilla type of warfare. (and i think it's great to see ArmA 3 is making a little reference to ancient history The Greco-Persian Wars, where the island of naxxos was conquered)
This approach of guerilla warfare is on itself very cool and gives a 'new reality' to the series. since ArmA 3 seems to be going this direction it might be cool not only focus on new stuff but prehaps also to reinvent the old stuff the vehicles for example, and give them an 'extra purpose', besides being a vehicle.
I like the fact in ArmA 2 that we can in an element of soldiers, order individual solders to a position of a building, it would be great to see a vehicle being able to act as 'interactive/position' cover in a situation where there is no cover so how about taking up positions behind a vehicle ? But how about making 'cover point' act if it was like mounting a turret (switch controls), but instead of controlling a turret you would control your cover, hide or popup
another idea of giving vehicles an extra/other purpose would be the psychological effect, for example let a jet fly over an enemy position as a show of force. prehaps not in the direct context of a plane flying over but the theme of psychological warfare in general would totaly fit the type of warfare Iran is into. And would add an extra layer of gameplay and tactical consideration.