Not much, other than Savoy taking over large tracts of India and the American interior. Oh, and Louisiana staging a successful invasion of the motherland. Minor factions are fun to play.
And has anyone else noticed that in the beginning of the game, the position of Stadtholder of the United Provinces is held by William III of Orange's evil twin? I understand that he has to be a separate character for gameplay, but at least make the portraits look the same...