Here's another interesting news released by Infinity Ward at the Call of Duty: Modern Warfarereveal: the game will support the use of mouse and keyboard on Xbox One who prefers this control system to the gamepad will not have to switch to PC.

Of course, even for those who use the mouse and keyboard on consoles will apply the same matchmaking rules applied to the PC: those who play with gamepad will only meet players who use the same control system, so there is no danger that a Xbox player with controller is put against another Xbox player with mouse and keyboard, unless you explicitly enable this option in the game options.