The Call of Duty: Modern Warfare Multiplayer PC Beta is now open to all.

This is available through Battle.net where a free account is required.


This post has details on how to get started, and how to opt-in for Crossplay

if you wish to do battle with your console brothers in arms. For more on what's going on in the beta, turn to the
Activision Games Blog. Here's their overview:

Get an early look at a collection of several maps and modes Call of Duty: Modern Warfare has to offer before it releases on October 25. Be among the first to experience the intense multiplayer action, ranging from the quick, close quarter 2v2 Gunfight mode, to traditional 6v6 multiplayer gameplay and larger player count firefights. Try new gameplay mechanics, including bullet penetration, gun mounting, door breaching and night vision multiplayer gameplay maps featuring night vision goggles (NVG's) that allow for an amazing tactical experience.


Source