Epic Games has announced that Rocket League will be one of the first games to use the in-development Unreal Engine 6. The company posted a short teaser showing refined grass, cars and lighting utilising the new game engine. Unreal Engine 5 launched in 2022 and it is unclear when this new version of Unreal Engine will make its debut. You can check out the teaser footage in the video down below along with lots of cheering from the audience.
Unreal Engine 6 revealed alongside Rocket League update

Unreal engine 6 already? Unreal engine 5 is still garbage and I know they are gonna build ue6 on top of that.
Many developers still use unreal engine 4, I mean the FF7 remake developers have decided to switch back to unreal engine 4 after rebirth.