Activision Publishing announces Call of Duty: Modern Warfare 3 is now available for Windows PC, Xbox 360, and PlayStation 3, along with the accompanying Call of Duty Elite service, which is currently for consoles only, but will eventually come to PCs, albeit in a limited form. Here's a bit on the game:

Co-developed by Infinity Ward and Sledgehammer Games, Modern Warfare® 3 delivers a full assault on gamers’ senses, including an intense single-player campaign that picks up immediately following the events of Call of Duty®: Modern Warfare® 2 and escalates into World War 3, as well as groundbreaking upgrades to the beloved Special Ops like the all-new Survival Mode. Special Ops serves as the perfect springboard to Modern Warfare 3’s re-imagined multiplayer, featuring the series’ trademark visceral gun-on-gun combat, a revamped pointstreak system with the introduction of “Strike Packages,” devastating new modes like “Kill Confirmed” and other gameplay enhancements, new features and a bevy of new weapons, equipment, and perks.