I've been waiting for confirmation from a dev about whether ghosts in single driving multiplayer will be viewable as as an actual ghost rider, and not as a simple marker. This was confirmed very recently.
I reckon the rival features will be where you set a player as a rival and you see all their replays as a ghost when you play any tracks, this would allow you to directly race one person.
I think it would be cool if you could set your own replay as a ghost rider so you can directly compare your own times.
