I have seen two smallish thread, relative to a normal Google update thread, that discusses changes in the Google search results. A WebmasterWorld thread and DigitalPoint Forums thread has discussion around some changes being noticed in Google.
Now, typically these threads are much larger. So I was a bit hesitant to post this information. In fact, I would not be surprised if this was just a quick blurb that went away.
This does come soon after the Yahoo November update this past Friday. The last Google update reported was in early November and turned out to be a bug in the search results.
Forum discussion at WebmasterWorld and DigitalPoint Forums.