I recall Cormyn saying that we'll be having two rounds of testing, closed and open.. He mentioned picking people from the leaderboards and also selecting a few hundred users with more than some AP. And he also said something about testers being able to invite their friends to testing.
Did you guys not read the blog? I believe there was mention of a handful of people from the leaderboards, and many people who aren't on it. I'm ranked 121 so...*hinthint*
We're looking at hand-picking a few people to help test the first portion of the site, and slowly expand it from there. We *may* allow the invitees to invite a few others down the road, but that's not confirmed yet.