https://wccftech.com/rocket-league-2-isnt-happening/

Rocket League 2 isn’t happening anytime soon, as confirmed to Gamespot by Psyonix’s Scott Rudi,  now Game Director on Rocket League. The studio intends to expand a lot on the existing game instead.

That’s preferable to do; games-as-a-service. The most valuable thing in our game is our fans. A lot of the stuff we do is focused on keeping them with us. Keeping them interested and all hyped up about our game. We want to provide a really good experience [for players] to have fun with for years to come.