Rocket League already supports cross-play in various permutations across a number of different platforms, but Psyonix’s big priority has been building a party system which will work across devices. Unimaginatively dubbed RocketID, this feature was set to launch later in the year on non-PlayStation platforms at least, but it has now been delayed into 2019.
The developer stated that the reason for the setback is so that it can make it “as intuitive, stable, and polished as possible before releasing it to the world”. Of course the upshot to all this is that PlayStation will very likely join the party, as the platform holder recently reversed its stance on cross-play and is currently running a beta with Fortnite to make sure everything’s working properly.
Take your time, Psyonix.