Looking through the pastebins negasora linked, it excites me. The terminology used sounds like it uses tournament mode, as it talks about remaining time (ready_up_remaining_time) and uses the word "lobby" a lot (eg LobbyTime) and also talks about CTF (CTFLobbyMember). Although it has a few mentions of quickplay and also a few mentions of Tour of Duty, so I'm not sure. Maybe this skill rating will be incorporated in lobbies, pubs, and mvm?
edit: also the line "TF_GC_TEAM_BROADCASTER" makes me really excited at the possibility of having a slot incorporated into the game meant for casters or broadcasters but who knows.