As we reported, Monte Cristo announced in a recent letter to the community that buses will be added to Cities XL in early December. According to a recent post, the system is now in the final stages of development. To prove it, Monte Cristo posted a video that looks over a dev's shoulder to show the bus system in action.
The video demonstrates that the system will allow you to identify your cities' traffic issues, easily build your own bus lines and manage them in detail. More information on how it all works should be posted this week, so keep an eye on the official Cities XL site for more information.