Rocket League October update to include free, underwater Aquadome map

Psyonix has revealed some details on the upcoming October update of Rocket League, and it will include a free map and a couple of cars as well. The Aquadome map will come with two free cars, as well as two premium cars for $1.99 each. The two cars, Proteus and Triton, do not have dates yet but will launch the same day as the rest of the pack.
Available in both casual and competitive playlists, the FREE AquaDome arena is a transparent glass dome hidden at the bottom of the ocean, teeming with aquatic life, including jellyfish, great white sharks, and more.
The trailer can be seen with a couple of screen shots below.