Currently yes this is only on xbox, we were hoping the cross play feture was up and running at this point but that doesn't seem to be happening any time soon.
While it is a step in the right direction, most have asked for a league on PS4 which this update only made it available to play PC users.
I have already gotten with Tris to try and get the PC side going for next season. With that bringing in its own new set of changes it will most likely delay the start of season 2 a little to make sure everything is ready to go. As I have posted before, when RL came out LG didnt support PSN at all. By the time LG did it felt like trying to make a RL league for that since it was already out for months would of been difficult. I personally am not a PSN player so when it was announced that it was coming out on Xbox One I got a hold of Tris ASAP to get a league going. Others could of done the same on ps4.
I know for a fact that people were asking about this on PS4, well before any xbox announcement. Maybe we needed to ask a few more times?
I know that alot of PS4 players wanted a league and still do which we hope to have at some point, but the same can be said before the X1 release as well. Its one thing to ask about if there will be a league and someone asking to actually run one, doesnt matter how many people are interested if no one is willing to run it. I went to Tris a month before X1 release with a League structure, rulebook, Trailer for the league to show I was actually interested in running a LGRL League.