There's a site that listed all of the new tracks, but I can't remember where it's at.
There's a new sunny town music (I believe. Not sure when Your Affection plays now), as well as an instrumental version of True Story from the anime. Some new music for the new trip(s) as well, not sure what else. I haven't played the game, but this is going by what I've read and heard from this board (and I heard the new town music in a video).