Developers have commit logs but it's not suitable as player-readable changelog. Especially if project is closed source, which for some weird reason most FOnline dev teams prefer (I guess in many cases because of ugly as fuck code, any other reason I could see would be some weird "server will be mine" mentality - which so far ends up with "all servers are shittier than they could be" and enforces people to re-implemnent simple things that other teams did already). John Carmack can give away source to his 3D hits, but some amateurish indie groups that will never earn any real money on copyright-breaking MMOs can't -.-