tedster - 7:53 pm on Oct 14, 2011 (gmt 0)
There was definitely another iteration of Panda released/applied in the last day or so.
From the lack of widespread posts about this, I'm assuming it was more of a tweak or - as Matt Cutts called it - "Panda flux".
A new, full blown iteration would be very early (the most recent was Sep 27 with some flux following if for more than a week afterward.
There are other "modules" or parts of the full ranking algorithm that only iterate about once a month or even less frequently. These can account for some of the update jiggling we see from time to time. These other modules would include things like automated taxonomy creation, taxonomy assignment of pages and query terms, or the re-calculation of semantic n-grams.
This stuff is all very intensive on the processing end (though probably not so intensive as Panda) and the effects of fully new iterations tend to land in a big bunch.