So, I have two questions. First, do you plan on adding replacements for traffic cars, or at least a custom add-on that replaces traffic vehicles? I ask this because I've seen some pictures of TDU in the past that had clearly modded traffic in the background (I remember two of them being an AMC Pacer and a Volkswagen Beetle), and since then, I've wished to have something like that in my game... particularly because I love the idea of rolling around with a cool sports car, or a high-end luxurious car, next to casual city cars, or even old beaters. However, I haven't found any mods like that, unfortunately, and most traffic mods are long since unavailable.
One such picture can be seen here, salvaged from a site that no longer seems to host it. It also has a texture mod I like, but I can't find it anywhere.
Next, how many events will take advantage of the new car brands and types? I imagine that a more diverse branch of car classes and restrictions can make the game be more unique, since each different car you buy would lead you to a different tree of events. However, I imagine it would be hard to implement, as there wouldn't be enough events to have enough for all different car brands from each stage of progression, unless it's possible for races to have more than one car restriction. And even if they could, this would actually make the earlygame harder, as it would severely limit the amount of events one could try as they wouldn't easily have the money necessary to buy more cars. That is, unless they constantly grind the events to re-obtain the pittance of money from early-game races... or if the rewards for the races are increased to compensate.