Revolution SpritePack adds 16 new skins for 16 nations just like western/eastern spritepack did. It is harmless DLC that has nothing to do with changing the gameplay and is more about adding new looks for your units. In my opinion, DLC like this is pretty useless, because it is just a pallet swap, but I guess there are people that want to be more immersed with the game and have their units look like they should in 19th century and I repsect that, although the sprites are made kind of lazy and with some units you won't notice much difference between nations. Overall, nice DLC to have if you care about this kind of thing, but completely insignificant for the gameplay.