Google’s Matt Cutts announced the action on Twitter and called it a “data refresh†that impacts less than one-tenth of a percent of English-language searches. Matt Cutts:
I read a blog about penguin update1.1 and data refresh a couple of minutes ago but I think it minor update and hopefully it does not affect much to webmasters.
I also hope it's a minor update. Prior Penguin updates affected lots of members on this forum and their sites.
It's all relative - 1/10 of a trillion sites is huge! I wonder what the change was to make that big a change. I noticed a mild serp change from now and the morning.