When Rocket League initially launched, I'm not sure even developer Psyonix expected it to become quite as massive as it has. This is exemplified by the news that Warner Bros' gaming branch will be taking over worldwide publishing rights from previous publisher 505 Games.
With this change, a new updated physical version is on the way. There is no confirmation quite yet as to what Rocket League content will be in this new version, but presumably the likes of the delisted NBA Flag pack sadly won't make it, while Warner Bros' own collaborations, including the Batmobile, hopefully do.
As you'd expect, both parties are happy about the new partnership. Kevin Kebodeaux, Senior Vice President of Sales, Americas at Warner Bros. Interactive Entertainment had this to say.
Rocket League has such wide appeal across all audiences, it’s no wonder the game is such a huge success. We’re very excited to be working with Psyonix to bring the game to retailers across the globe.Vice President of Publishing at Psyonix, Jeremy Dunham, was similarly enthusiastic.
Warner Bros. has already proven to be a great partner. We first collaborated on Batman v Superman DLC for Rocket League in early 2016 and we have continued to be impressed with the team’s knowledge, professionalism, reach and enthusiasm for video games. They are the ideal partner to help us push Rocket League to another level at retail.There is no word on when this new version of Rocket League will be coming, but if we had to make a guess, expect it to tie in with the Nintendo Switch release of the game this holiday season.
We've got the full list of Rocket League achievements - check the list for guides to unlocking them.