Just a few things I'd like to see in 2.0 besides new tracks:
1. The soccer fields should be separate from the race tracks in the addons repository.
2. All of the arenas, or as many as possible, should be available in singleplayer. I don't know how hard this would be to do.
3. Follow the Leader should be replaced with a standard player elimination mode. Having to stop because the leader kart keeps crashing can be very annoying and ruin the gameplay experience.
4. This will be controversial and I probably suggested it before, but I think 2.0 shouldn't have a story mode but a challenge/objective mode that STK used to have.
Thoughts?