Psyonix promised there would be news for Rocket League at The Game Awards and they followed through on that. The team has introduced the "ultimate modern sports car" to the game in the form of the "McLaren 570S Car Pack".

The new DLC turns the McLaren 570S Coup?into a battle car as well as including a Flag and two new Player Banners. Unfortunately, players won't be able to customise the car with other Wheels, Toppers and Antennas other than those that are included in the DLC pack itself. You can take a look at the car in all of its glory in the trailer below.
https://www.lolga.com/