Google Panda 3.2
Google said this happened about a week or so, so I would place this Google Panda 3.2 update as happening on January 18, 2012.
Why 3.2 and not 2.x? Well, I spoke with a Googler back in late November, they expressed that one of the 2.x updates we labeled as a “minor” update, should have likely been named as a major update and thus labelled a 3.0 update. I personally believe that was an October Panda update, that we did not cover here, but I do not have confirmation on that. In fact, Google does not number their updates, so it is hard to nail down.