Cities in Motion 2 is city building game where the only thing you're building is the transit system, like roads, trains, buses, and so on. Buildings get placed automatically, players just have to focus on making sure the citizens can get around the city in order to make money.
This Cities in Motion takes place in the modern era, with a new night and day cycle based on 24 minute increments. Players will now have more control in how they can control their transit system. For example, you can make it so there's more public transportation options during rush hour in the morning, and then flatten out the schedule during non-peak hours.
The sequel will also have a multiplayer mode where people can work together or competitively to design the better transportation systems. Additionally, there will be a campaign featuring 12 scenarios, a sandbox mode, and map editor.
The team is taking what they did in the first game, and adding some more depth and control over the core systems to give something more for fans. Oddly there were no screenshots provided, by what I saw of the game was looking nice with the detailed environments. Cities in Motion 2 should be out sometime in 2013 for the PC and Mac.