After playing an hour or two:
+ you can use any car on any track for time trials (I think), somewhat easing the heartbreak of less rally tracks
+ the track I played for raid was an interesting point-to-point track, and a massive improvement over the crap desert raid circuit tracks of DiRT 1, helping fill the rally void again perhaps
+ saving and loading car setups is instant, and you can tweak settings on restarts easily without having to load the track again
+ quicker loading I'm pretty sure
+ multiplayer options look very good for those who enjoy racing rather than crashing into others for fun.
- I can't delete unused cameras

- rally calls have been simplified to easy left, medium right etc. Admittedly, calls in DiRT 1 weren't always accurate so maybe it doesn't matter so much.
- car setup is vastly simplified, but maybe this isn't such a bad thing
- stupid shitty stadium racing is still in
I think I'll enjoy it overall. Anyone get it?
Just found out there is an option for technical co-driver calls somewhere.

Must investigate when I get home.