While the new DLC releases on August 18, fans of the Lombax and his metal friend have until January 3, 2022 to pick up the in-game items. These new items are free, and all players need to do in order to claim them is sign into Rocket League on a PS4 or PS5. Unfortunately, for those playing the game on other platforms, the new content is exclusive to Sony consoles.
https://www.lolga.com/rocket-league/trading-prices