For those of you playing in the Arma 3 alpha on Steam, you can now download the latest version of the game.
The first big update has now gone live on Steam and should download to your client automatically via Steam itself. This first update improves and tweaks a lot of things to start bringing this alpha version of the game towards what BI want the final result to be.
Not only are there bugfixes and tweaks, but this update also adds a few little things, such as new ending screens for scenarios. You can read the full patch notes at Steam.