Google has confirmed that an refresh of Panda was rolled out on Monday, November 5, 2012. This is it’s 21st incarnation since its release in February 2011.
Worldwide, this is expected to affect about 0.4% of regular queries, and a few more in the US in English, at around 1.1%.
For a look at previous Panda updates, and how they affected queries, check the Dojo’s Google Updates Page.
If you think you’ve been affected by this refresh, for better or for worse, let us know in the comments.