Indie developer Psyonix has officially released the previously announced Hot Wheels content and PS4 Pro support updates today, the company said in a press release. The Hot Wheels content features two premium DLC Battle-Cars (which retail for $1.99), the Twin Mill III and Bone Shaker alongside a free "Hot Wheels" Topper and Antenna, Treasure Hunt Flag, and Shark Bite Topper, all of which come as post-match unlocks.
The PS4 Pro update allows Rocket League to run at 1080p, 60 FPS on a standard PS4, while hitting 4K, 60 FPS in all of the game's arenas for solo play and two-player split-screen modes. 4K, 60 FPS is almost unheard of since the PS4 Pro launched, so that's quite the technical achievement.
If you like, you can check out the full patch notes here.