Microsoft announced last month its plans to allow cross-network play with other platforms to offer developers the option to code the games themselves with the approval of other console networks.
According to Xbox's news blog post, Microsoft's Chris Darla explained to Rocket League fans that the game will allow cross-network play between PC and Xbox One. He also hinted that the game will be open to cross-network play with "other console and PC networks," specifically with Sony's PS4 and PSN.
Microsoft's European head of ID at Xbox, Agostino Simonetta, assured that the technology is available and that the company is ready to use it. Simonetta told Eurogamer, "As far as we're concerned, we've made the announcement and we're ready, whoever wants to get on board. It remains an open invitation to any network that wants to do the same."
Rocket League is looking to become the first title to take advantage of the feature. However Simonetta didn't make it clear as to when Xbox One owners would be able to play against PS4 owners, adding, "its always up to the developer to decide. We issued an open invitation."
The prospect of linking the PlayStation Network and Xbox Live seems promising, although Sony's response to Microsoft's invitation was not yet determined, in which Sony neither confirmed nor denied the possibility of making a cross-network partnership with its primary console competitor.
Today, Sony is sitting on a large multiplayer base in the console world, and plenty of players choose one console instead of the other because everyone else is already in one network. So it's less likely that Sony will accept Microsoft's offer, but Simonetta hopes to convince the makers of the PlayStation to take advantage of the deal.