Psyonix released a trailer for the upcoming Chaos Run DLC for Rocket League, which has a very Mad Max Wasteland feel.
Players will get to play out matches in the new Wasteland arena, though that arena will be freely available even if you don't buy the DLC.
If you do invest in Chaos Run, you'll be able to race around in two new post-apocalyptic vehicles (Ripper and Grog), equip two new trails (Sandstorm and Nuts & Bolts), choose from a variety of new decals, spruce up their ride with a new paint job (Camo or Sun-damaged), equip two new wheels, or choose from a variety of new toppers and antennas.
You can see some of these new items in the trailer for Rocket League's Chaos Run DLC.
The trailer only reveals that the DLC will be released in December. Psyonix doesn't seem inclined to be any more specific than that.