Microsoft announced it is opening up network gaming to allow players of games on Windows and Xbox to compete against players on other platforms. Rocket League will take advantage of the feature with Xbox One/PC network play allowed later this spring. This means that PlayStation players could in the future face off against Xbox One players online.
Sony responded that they’d be open to a conversation ‘with anyone’ about cross platform online play. Please note that Sony has allowed online play between PC and PlayStation since it first came out.