At some point, maybe when it comes out fully, it'd be nice if alpha players/backers higher than captain recieved a profile background(s) for steam, as there aren't many good civil war backgrounds and WoR can really help the steam market.
Also, trading cards for completing things in the game, like capturing an area, winning X amount of battles in a row, killstreaks, 5 kills with a bayonet in one life, killing three officers in one life, etc. All that stuff would be good for when the game comes out fully.