Are threads moved from the into to the queued by the Admin as a kind of "In" tray requiring attention ?
That pretty much sums it up. It's simply the next step in the approval process. Your thread stays in the Introductions board for a while, then moves to the Queued Introductions once it's time for the Goddesses to decide upon your fate.
Of course, in all likelihood, it will stay in the Queued Introductions for a while as well, since our moderators have obligations outside of Ellquiy. Good luck with your approval!