Also take this as a rumor for now as it is not official but amazon.de leaked a season pass including content descriptions, which you can see below:
The Project CARS Season Pass 2015 provides early access and savings for over 30 new cars, 20 new tracks, new game-modes, features, career-events and more.
Starting this April, you will get new content each month:
- Car Pack: "Racing Icons"
- Expansion: "Audi Ruapuna Speedway"
- Car Pack: "Old vs. New"
- Expansion: "Red Bull Ignition"
- Car Pack: "Aston Martin"
- Expansion: "Lotus Classics"
- Car Pack: "Renault Sport"
- Expansion: "Toyota & Mitsubishi Macau"
- Expansion: "Ford Oval Racing"
The Season Pass provides the following benefits:
- savings compared to single purchases
- one week early access
- 50 exclusives liveries
The additional content will be released between April 2015 and January 2016.