New vehicle classes become unlocked, and cars get faster as you climb from class 4 right up to class 1. (consoleob.com)
Among the 350 cars, several new vehicle classes have been added to reflect these varied landscapes, including class 10 open wheel buggies and extreme offroaders. (theguardian.com)
That being said, the premium DLC is a bargain, especially since you get a whole new vehicle class, a new career mode Season based around it, as well as what feels like a completely different way to play the game. (useapotion.com)