David Hodgson and James Mattone:
The Call of Duty: Modern Warfare Beta is coming to Battle.net!
Coming this Friday to all players or Thursday for those who pre-order the game this Beta is your chance to test out the game and provide valuable feedback and information to developers as they prepare for launch. Plus, if you have friends playing the game on consoles, dont fret; the Beta will include Crossplay for the first time in Call of Duty history, allowing you, the PC gamer, to defend your honor against console users.
Source: N4G PC Modern Warfare® Beta*: PC Minimum Specs and Settings