mhansen - 10:07 pm on Dec 11, 2012 (gmt 0)
Some really weird update happened last night.
I have seen several people mention something happening on Dec 10, in the evening hours. Our site that was affected by the "April 24th" update (commonly called Penguin, but we have doubts) saw a 2-3 hour window of pre-penguin traffic from Google last night as well. Around 1 AM, it turned right back off, to where it still sits.