Some tanks will pop smoke, US tanks will attempt to pop smoke but instead shower themselves with beer
Some units will have an evasion function, so long as it's not silly and works in co-op. Can't say more than that till we have it working. If we have processing power to have behaviors for autonomous characters interacting with compounds and other structures then maybe. But we're an Apache Combat Sim first and foremost.
My personal take based on a case study of a AAA game:
What's likely to happen, if we spend an additional month or two developing AI behaviours for different kinds of formations, a player is probably going to smack them all down in seconds with a full Hellfire loadout before the AI has had a chance to twitch thus rendering the exercise and additional development time pointless.
For example, Halo(2 I think it was) had great AI, but hardly anyone ever got to see it and consider the AI was terrible. The reason was simply that players are overpowered and often killed the AI before they are able to exhibit any of that cool flanking and communication behaviour.
So doing things like popping smoke, formation changes and calling for help, even ducking and rolling are things that are easy to do. Running around looking for hiding spots requires dedicated pathfinding for different unit types.
Some units will get special treatment but it all eats time. Just have to see what works. It's a good question though and I'll certainly worry about it.