https://www.techradar.com/news/xbox-keyboard-and-mouse-support-is-close-but-depends-on-devs

Microsoft's Xbox One consoles should be getting support for keyboards and mice soon, according to a tweet from Mike Ybarra, corporate vice president of Xbox and Microsoft, and corroborated by an Xbox blog post. 

The blog post explained that Xbox Insiders will have access to the functionality in the coming weeks, with Warframe being one of the first titles supported.