https://www.techradar.com/news/microsoft-has-no-plans-to-block-keyboard-and-mouse-support-on-xbox-one

Though Microsoft hasn’t announced any official support for keyboard and mouse on Xbox One just yet, there are still ways to make it happen.

Though players have raised concern over the fact that keyboard and mouse users could have some advantage over those using console controllers – particularly in the case of multiplayer shooters – Microsoft has now explained why it has no intentions of stopping them.