StarCraft 2 is not out yet.
It does not have a release date yet.
There is no available beta yet.
The system requirements are not known yet.
The game is currently in development and no more information is going to be released for awhile. Try again in a few months and there might be more info. For now, Blizzard isn't saying anything. All we know is that it should be released before Duke Nukem Forever.