Voted battlefield AI.

What I´d really like to see is that CA would produce a genuine war-engine with all the required contents for all types of war from 3000bc to the modern day and let the community of modders and players create their own mods. This way we can get the kind of games we want while CA only work on the AI and the platform of the game itself.
You all know HTW, NTW, RTR, (EB) etc. they are all very good work. IMHO better than the original game itself or games like MTW XL that enhanced the vanilla game to a maximum extent. CA should provide the tools and the modders should develop the actual games. That´s my dream in the future.