I'd love to, too, but since Codemasters said they focus mainly on the Online part, i don't have high hopes.
I generally miss a lot of single player/offline features, like saving your times and replays(maybe a ghost or two), hot seat or splitscreen multiplayer (several rally games managed to pull this of, including Colin McRae Rally 1) and most of all, more different and longer SSes, but i'm not very optimistic for any of these to happen (so far, nothing offical seems to hint at that).
I think this game has a lot of potential, but if Codemasters continue like this, i guess this game will be mostly played by the DiRT demographic and vanish when the graphics start to show their age (which may be quite some years from now, but still...).