Rocket League Collector's Edition is a physical release of Rocket League, co-published by Psyonix and 505 Games, collecting three existing DLC packs along with the original game, and adding in 4 additional timed-exclusive vehicles.
On November 9, 2017, Psyonix announced an update to the Collector's Edition:
"In partnership with our new distributor, Warner Bros. Interactive Entertainment, Rocket League: Collector’s Edition for PlayStation 4 and Xbox One will soon be updated with cool new content, featuring Wheels and a Player Banner inspired by DC Comics’ The Flash! As an added bonus, players will also receive a DC Comics Player Banner."
In addition to the base game, the Collector's Edition includes:
Revenge of the Battle-Cars
Limited edition art print by Psyonix concept artist, Jay Zhang, showing Octane and Road Hog.
Rocket League® - Collector's Edition Teaser
Collector's Edition teaser trailer.
2017 box art.
End game screen showing The Flash wheels, The Flash player banner and DC Comics player banner.