The number of players Rocket League supports in a single match will remain 4v4, until bigger stadiums are introduced.
Rocket League, which finally hits Xbox One this week, is probably not getting a player count increase for a while. The game currently supports up to 4v4, and according to developer Psyonix, more players would make it "too crazy."
"But for now, more than 4v4 we think takes a little bit away from the enjoyment of the game; it gets a little too crazy."
Rocket League's second season, is now in effect.