Psyonix the creators of Rocket League who are now owned by Epic Games has recently confirmed that their vehicular soccer video game will be going free-to-play on all platforms later this summer however, this move will remove the game from Steam for new players. Existing owners of the game on Steam will continue to receive updates and support, but going forwards all new players will have to install the game from the Epic Games Store.

The summer update will also bring a new cross-platform progression system that will require an Epic Games Store account to use, this will finally let users access their items, rankings, and rocket pass progression across all platforms. Current owners of the game will receive all the DLC released for the game when it goes free-to-play along with an "Est. 20XX" title which displays the year they purchased the game.

Update: A clarification was sent out earlier today where Epic said that they won't stop supporting Rocket League on Steam, as they never could actually do, since legions of players that had already purchased the game on that platform would pick up their pitchforks with a vengeance. However, wording on Epic's clarification leaves much to be desired, and seemingly confirms that the game will not be available on Steam:

"The PC version of Rocket League will come to the Epic Games store in late 2019. In the meantime, it will continue to be available for purchase on Steam; thereafter it will continue to be supported on Steam for all existing purchasers. (...) "Rocket League remains available for new purchasers on Steam, and long-term plans will be announced in the future."

Epic Games has announced the acquisition of Rocket League developer Psyonix, which created one of the most addictive non/Battle Royale game of recent times. The move by Epic will see the games- introduction to the Epic Games Store, with platform exclusivity confirmed for late 2019 / which means that anyone looking to purchase the game on a PC/centric digital storefront will have to go to Epic's, since Steam will be leaving the vendor equation.