The Rocket League cross-platform party system will be released in February, development studio Psyonix announced earlier this month. The update was reportedly delayed because Sony's PlayStation 4 console did not support the system.
The cross-platform multiplayer update was already announced in August. The studio called the system Rocket ID but has since moved towards the more generic term Friends List.
On January 14, 2019, the studio announced that the PlayStation 4 version of the game now also supports cross-platform multiplayer matchmaking. However, players still can't make parties with players from other platforms.
The Rocket League cross-platform party Friends List system will release in early February. It will support PC, Xbox One, PlayStation 4 and Nintendo Switch.