The DC Super Heroes DLC for Rocket League has been released that brings players the power of the 1989 version of the Batmobile into the game as well as two Bat-Cars from the 2012 version of Batman. In addition, players can score more than twenty DC-themed items for their vehicles including banners with Superman, Wonder Woman and The Flash (to name a few) on them.
The DLC is $4.00 and is available on all platforms.
You can learn more on the Rocket League site.