Salty Shores is the name of the new arena heading to Rocket League with the update due on May 29th and it looks lovely. This isn't some seasonal special either, it's a new permanent addition to the online playlists.
Check out their little trailer:
On the same date, they will also be giving out rewards for the Competitive Season 7 along with the start of Season 8. There's going to be a new 'Impact' crate, fresh music additions to the already fantastic soundtrack (seriously, it's divine) and a Report Server button if you get a particularly rubbish server.
On top of that, the next in-game event is now confirmed for June 11th called 'Beach Blast', but they're not giving out many details on that just yet.
As a reminder, you can pick up a copy of Rocket League cheap in the The Humble Hooked on Multiplayer 2018 Bundle along with some other titles.