Not necessarily changes but things like new maps, a mode, ect. The additions are nice but as far as we know don't serve a purpose/don't completely change the game.
Unless they add more stars, new clothes would only serve as an aesthetic change, and only if you actually like the clothes. Music is nice, but again, it's not like it changes the actual game itself. Adding an S Rank doesn't really have a purpose other than the title, and even then the only way to get S is to play ranked like it is now with random people, so it's not like most people will be able to obtain it. Besides the things it unlocks the level cap itself is also just another title that doesn't do anything. While matchmaking and squad battles are great, at it's core it's not like they change up the game; you'd still be playing in a 4v4 in x mode. The only difference now is that you play with specific people. The main thing for me is the new weapons but if I don't like them then, oh well.