The much-anticipated keyboard and mouse support has been added in the recent Xbox Alpha Ring update.
From this point onwards, developers can now choose to support keyboard and mouse controls for Xbox games. For now, the control scheme is only available for use within the system’s tile-based UI, but soon Digital Extremes’ Warframe will be the first game to support it natively in-game.
The other addition in this update introduces the ability to use the guide search to find ready to install games and games that are part of a subscription like Xbox Game Pass.
Included in the update is also a large series of bug fixes.
Source: Xbox Wire