Arma 2 is going free-to-play. Really. It's a bold move from Bohemia and a fascinating one. It's basically a cut down version of the game, allowing you to play the multiplayer aspect - complete with multiplayer servers and the powerful editor - for free. The original games will remain, and you will need those if you want mod support, the full suite of graphics options, or the story campaigns. This is, then, like a big fancy demo. Of a genuinely great PC game.
Trailer below, some additional info here, and we'll have more on this next week.