Microsoft just announced that game developers can now create cross-platform multiplayer modes that work with other consoles and operating systems, which means that the future games could feature a multiplayer mode that works with both Xbox and Playstation gamers. Microsoft is now clearly the underdog in console race, and by opening up cross-platform multiplayer, they could convince late adopters to buy an Xbox One even though their friends have a PlayStation 4. It’s also a way to make sure that there are enough players for less popular games. With Microsoft mentioning cross-platform multiplayer between the Xbox One and Windows, cross-platform multiplayer between PlayStation 4 and PC players could be also possible. The first game that is going to support cross-platform multiplayer is Rocket League. http://techcrunch.com/2016/03/14/xbox-live-now-supports-cross-platform-multiplayer-with-ps4/
Sorry, Microsoft, already got a PS4Please Register or Log in to view the hidden image! A friend and I had a chat a few years ago about how cool it'd be if we were able to party up across platforms, but back then we both said "it won't happen because of the $$$". Now it seems like it will (for certain games, probably not the big triple A titles though).