tedster - 3:00 am on Dec 4, 2012 (gmt 0)
Seems like there's a refresh in Penguin shortly after Panda the past few months.
According to our Update records [webmasterworld.com] Penguin has only been updated 2 times all year, whereas Panda has seen 9 updates. In fact, the gap between the last two Penguin updates was 6 months, but Panda saw 6 updates in that same period. So I have trouble seeing a connection between the two.