According to a post by Chris Charla, the Director of ID@Xbox, the Xbox One will now feature cross-network support for both PC and “other consoles.” Players will still be able to play exclusively with other Xbox Live users.
Psyonix’s Rocket League will be one of the first game to provide players with the option to play against players on other networks.
Ultimately, it will be up to independent developers to take advantage of the open invitation.