Sand - 2:57 am on Dec 12, 2012 (gmt 0)
I saw some similar things, Splugged. Overall, from Friday - Sunday, I had some really abnormally low hours and some really abnormally high hours. At the end of each day, aggregate traffic was average. But the pattern was absolutely bizarre.
Yesterday (the 10th), I had three hours (9AM - 11AM EST) that were about quadruple normal (best I can tell, I was showing up for all kinds of things I've never showed up for before). All other hours throughout the day were normal.
Today, traffic has returned to its regular predictable hourly patterns. If there's a gain or a loss, it's small at this point. I will be interested to see if this is finished, or if the testing they seem to be doing the last few days will result in a larger long-term shift.