I dnt currently have any arma stuff so im assuming it will cost me some dolla to download off steam just wondered if there was atch anything left of the game for me to enjoy and play as it looks amazing

So im about to download arma 2 bla bla bla to play dayz, but if it has just been released that a standalone game is in development is there any point me getting the mod now, or will the game be ages in coming out and therefore worth the money buying the mod. Hope this is not a dumb question but I dnt wana download something that is on its way out? wats the crack?