I would like to see the ability to comp stomp implemented into the game, these co-op matches are a nice and fun break from pvp and a must have in my oppinion.
Unit icons should be added when zoomed in, something like the infantry displaying what type of unit it is. Now im not saying that you need an icon that tells me if its a T55, a T62, T72 or anything like that, just a icon that displays that said unit is a tank, or an AA unit and what not, granted you can see the icons when zoomed out and theyre all explained in the manual but the last thing i want to do in the middle of a firefight is to bring my camera all the way out of the map to figure out which unit is a tank and which unit is an AA. This helps a lot with new people who arent familiar with the units native names, for example in my very first game i played a 4v4, we got helicopter rushed and i spent a good 4 minutes trying to find my damned AA units, after a game or 2 you get used to it and can find units without a problem but from time to time things get really hectic and you lose track of where everything is, you could also argue that i could just start a private match and have a look at all the units but theres a difference between managing an army in an empty server and managing an army while fighting another player.
This has already been mentioned but the ability to see other players decks in a replay would be nice, and a sort of like time bar that allows you to select a certain section of the replay when ever you feel like it.
The only games that comes to mind right now that use this ability are black ops, and company of heroes, im sure there are more.
The ability to set your units facing with right click would be pretty nice too, not sure about formations i dont really mind them too much.
With 300+ units in the game, comparing each others stats becomes quite a pain, so i think a compare button is much needed.