Just noticed that after rolling over into round 21, the unlock threshold has changed from 500, to a whopping 100,000?
Was this something that was programmed a long time ago, and not looked at again? Or do we really want to stop admitting new people to the alpha now? That's the effect of this super high threshold: there will be no new alpha users until Beta Launch unless the threshold is lowered.
The timing is unfortunate: we're just getting into gear to encourage G+ users to jump into the Alpha. Not the best time to shut the doors to the Alpha?