So i talked to my friend at blizz yesterday and he explaind to me the way they do there testing.
First there is 3 stages of the Alpha:
1. For the world developers
2. For all the develepers
3. And the stage we are at now, FnF stage
Then there is 2 stages of Beta
1. Where a very small amount of invites go out over a period
2. Where they start inviting alot of players into the beta
And he also told me the are consedering adding a Charlie stage
He told me about it and that is stress testing of basicly and that means everyone can download and play it