I can also confirm that I have also seen drop in some of my websites around this time. Like everyone else here, these are good websites that have been there for more than a decade. It looks that if you are white hat, Google punishes you repeatedly while spammers thrive.
The funny part is that without getting very sophisticated, when I simply search my keywords here in America, the rankings are better than ever. So I wonder if I am losing overseas traffic. I also notice that the Adsense CPM is higher than ever -- meaning more US traffic -- and that has tempered the impact on income.
During last few days, I am noticing a small recovery.