Since this morning, I haven't seen any new first posts to review in the First Posts queue (at least from about 2012-12-10 01:28:29Z).
There have been some. One can tell because the number of reviews has been increasing during the day (~10 since this morning). I was also surprised to see that nobody has reached the threshold today (sad upvoter bots).
Has the automatic fill been reached? Or are only fresh first posts coming?