We’re starting fresh with Distance and rethinking almost every aspect of the game. Nitronic Rush was a student project and in many ways only a prototype for what Distance will become. All of the major things that the fans loved from Nitronic Rush are making an appearance again like the car mechanics, obstacles, and the general feel of the game. A large element that we’re improving upon is the world and atmosphere. The city in Distance has a mysterious past and is much more detailed. There's also a strong focus on multiplayer this time since it was sadly missing before. With that said, there will be many more modes this time around to greatly add replay value to the experience. We’re also working on making the modding and customization support much deeper in Distance. Along with that, we’re releasing a level editor so anyone can easily build and share levels with others. Last but not least, the game will be supported on both Windows and Mac with possible Linux support as well once Unity 4 comes out.
So, in other words, there were tons of car abilities, modes, track types, and other major features that weren't shipped with Nitronic Rush. Distance is taking the core of what players loved about our last game and adding more content and features that just weren't possible before.