ps: c'est plus tard dans l'année
En gros, d'abord l'alpha avec des assets limités puis plus tard dans l'année un programme beta plus vaste.
http://www.bistudio.com/english/company/developers-blog/285-scanning-the-horizon-arma-3-in-2012
The Community Alpha will be quite limited in terms of the assets it includes, with the goal of providing enough content to experiment with the brand new bits of gameplay and technology. It also enables our passionate community to prepare their mods for the very latest version of the Real Virtuality engine. Then, later on in the year, we'd like to open up our game up even further with a more extensive beta program. The exact details, however, we intend to set out closer to their launch.