Rejoice! Arma III is coming out on PC on September 12. Developer Bohemia Interactive will be celebrating the launch by hosting a live today at 17:00PM UTC over on their Twitch.TV channel. You can grab the came now while in beta before it goes up in price, for either $44.99 for the standard edition, or $59.99 for the deluxe edition.
This will only include the multiplayer plus mod features, and the single-player campaign will be released in three parts after release.