https://wccftech.com/call-of-duty-modern-warfare-will-support-mouse-and-keyboard-on-playstation-4-too/

Call of Duty: Modern Warfare will allow full multiplayer cross-play between PC, PlayStation 4 and Xbox One, a first for the franchise owned by Activision.

Of course, the news – great in itself – begged the question of how balancing would be handled between the different control inputs and platforms. Luckily, Microsoft enabled system-wide mouse and keyboard support last year for Xbox One, but the same cannot be said about Sony’s PlayStation 4 console, where mouse and keyboard support is still rarely found and only on a case-by-case basis.