Is there any likelihood of any more modern battles being added as DLC ?
Not so modern not so new, but yes
Something like a theoretical war from the 80's between NATO and Eastern armies in Germany would be great;
Of course no
or America and Iraq ?
Highly unequal troops, it is unclear how to do good
Although the 'Black Sea' theoretical conflict has been done by BattleFront, their maps are very small whereas your maps are large and therefore much more useful.
Much more useful would be a real conflicts, which is already more than enough. Hypothetical unnecessary.
If you want somthing "hypotetical" we do separate branch of games
http://shop.graviteam.ua/games?product_id=68