Well, first the arbiter shouldn't be nerfed, some times he can be unfair because he's invisible fully upgraded but his attack is already sorta weak.
second, the points to get to general rank should remain the same, it can be hard but that's because its a very high rank, when you reach the general rank you'll be glad that you really earned it and didn't beg for them to make it easier.
thirdly, in some countries genral is not the highest rank, in Switzerland Field marshal is higher than genral so that should defiantly be added.
fourth, there should be rewards for ranking up like when you reach general you get an extra 10 population or something
Fifth, New game mode, you and 4 (or 5 if possible) teammates hold off from waves of enemeys increasing in difficulty as the waves go on like debuffing skulls are added or enemeys are stronger and more come, say 200+ enemies or something
and last, will there be any more 3v3 maps? and is there going to be a unit pack? new units would be awesome.