on the topic:
alpha-beta-participants will be selected by countries? or totally random?
They haven't really said how they will select but this is what they have hinted at so far,
Participants will be selected based on their involvement in the community. Those who are constructive in asking / answering questions, starting discussions, etc. will have a higher chance of getting invited to help test the alpha.
Basically just sign up for the Beta and that's it. From what they said at Gamescom anyone who signs up now will probably get in though that might change at Pax this weekend.
thanks for the info!