Rocket League has kept a solid string of updates and extra content. Given, some of them have required microtransactions, but still. Most recently has been the new Rumble mode that brings combative action to the soccer fields. Since then, Rocket League has been advertising the upcoming addition of the AquaDome. Check out the trailer below.
No submarine action, though.
Today, the AquaDome is available for all owners of Rocket League. The new content includes the new arena for competitive matches as well as a couple of new, aqua-themed vehicles. So if you've been holding out for a water theme to pick up Rocket League, now's your chance. If you're waiting for something more than that, then maybe they'll do something like space next. Who knows?