If you have a permanent account or paid early adopter account, you're a part of the first beta group. For more details, see:
Sorry we can't open it up to everybody at once... that'd be too much of a flood, both in terms of hardware resources (which we haven't bought enough of yet) and feedback (we know there are some rough edges still).
But when we do open it up to all of you guys, it'll be all the better for having gone through a moderately large beta test first.
We'll be posting again when we have news about its final opening or if we decide to first do a larger beta testing group.