Discuss.http://news.xbox.com/2016/03/14/letter-chris-charla-idxbox-updates-gdc/
Cross-Network Play
First, in addition to natively supporting cross-platform play between Xbox One and Windows 10 games that use Xbox Live, we’re enabling developers to support cross-network play as well. This means players on Xbox One and Windows 10 using Xbox Live will be able to play with players on different online multiplayer networks – including other console and PC networks.