The squad-based FPS Gotham City Impostors is now free to play. On August 30th, 2012, Warner Bros. Entertainment announced that Gotham City Impostors would go free to play. If you get GCI on Steam, you have access to the DLC content that the current players already have. It is not known why Warner Bros. Entertainment made this game free to play, but I figure that they will release more details. I personally don't like that F2P players get what the normal players have. But, I guess that's how business works, unless I'm wrong. Also, apparently there was a glitch on Steam where it would show the game in your library when it wasn't installed, yet it wasn't grayed out, but that was fixed.
Source: Personal Knowledge