Psyonix just announced that Rocket League would be getting a PS4 Pro patch next week.
The update will let Rocket League run at 1080p 60fps on a standard PS4 and 4k 60fps on a PS4 Pro in all arenas for single player and two player split screen. Three and four player split screen on the other hand will have 60fps in most arenas at those resolutions. The update will also add support for Hot Wheels Premium DLC cars and Hot Wheels post match item drops. More PS4 fixes include performance optimizations and bug fixes.
Psyonix promise more content updates for Rocket League in 2017. Rocket League is available on PlayStation 4, Xbox One, and PC.
Source: God is Geek