Announced via
Rocket League‘s
official Steam page, the effect (seen in the Gif below) is easily one of the best. After getting the ball into the goalpost, players are treated to a Bat-Signal outline with bats fluttering everywhere. Of course, this explosion is only available for use if you are driving the Batmobile; the effect isn’t equipable on any other Battle-Car.
As mentioned above, this update (which comes on November 14, 2017) will be free to everyone who already owns a Batmobile in-game. Those who grab the fan-favorite car via the “Batman vs. Superman: Dawn of Justice Car Pack” for $1.99 will automatically include the Goal Effect moving forward.
These kind of partnerships are not uncommon — even specifically with Warner Bros. and DC. The Batmobile itself released as a promotion for the Batman vs. Superman: Dawn of Justice movie.