If they keep it hisorical it won't be whoever has the most guns on the field. Combat will be simmler to the other TW's except "Skrimishing will make a bigger difference. Most armies at that time exanged a few vollys then the attacker charged, making the battle in the end decided by hand to hand. The fact that you need to charge into missles will make sure that you need to carefully plan your attacks so you either have overwhelming local supporiority or flank them out.

Take a look at some of the battles in the 7 years war, War of Spanish Succesion and the Great Northern war to get an idea about the battles and tactics of the era.

CA will the map include Europe? or just the colonies?