I love the innovation with the new races Lopodo did.
I know this wont be easy to program, but I was thinking if we could introduce a "Secret Operative" Race.
Part of war is the element of suprize, and with this race I can choose to either increase the attack or defense by 5% say, without the other players knowing which one I choose.
I think that would be a cool race but it wont be easy to implement.