So I love RUSE and hope we will be seeing a sequel.
1. Stronger Infantry- Infantry is the base of every army. They should be better than just for ambushes. Give them more range and the ability to dig in.
2. New Infantry classes- Mortar teams and machine gunners. Add some veriety to infantry.
3. Sea Battles- Add a new front with sea battles. Have maps with a little water or a full blown island hopping map. Transport units over the water and flank enemies.
4. Transportation- Capture railroads which can move troops quickly or destroy them to deny them to your enemy. Get rid of bridges to lock off routes.
5. New Factions- Japan would be a great faction to accel in sea combat. Seeing lesser familiar factions like China could be a great addition.
These are just a few ideas i came up with to improve the game. Hope you like em. Lets see some ideas you guys can come up with.