Rocket League continues to sell like hotcakes, and its frequent updates have allowed it to maintain a steady life with many of its players. Those updates, as well as the high concurrent playerbase are also why we may not see a sequel for a long time.
Speaking with Youtube channel Kinda Funny Games, developer Psyonix Vice President Jeremy Dunham said that the game has sold 10.5 million copies, with almost 29 million registered players (this includes PlayStation Plus sales and split-screen players who may not have bought the game). Seven million of those players played last month, according to Dunham.
Speaking on the topic of a sequel, Dunham said they're hesitant due to the way a sequel could split the playerbase. ""Why would we want to take this huge community that we've already built, that's still growing, and say, 'What you're playing now is going to be irrelevant in 12 months," Dunham said. "Our goal was to keep making Rocket League better and better so that we don't lose any of the people that want to play." Dunham said the developer is still looking at new features and ways to improve Rocket League well into the future.
I have to imagine a few people around the office here are bummed they won't be playing a new Rocket League soon, but the current one should be good enough to console them.