I am not surprised but I wanted to report back to you all that Google is not confirming or denying that there was an update last week. They are simply not commenting.
John Mueller from Google isn't really commenting either but he did reply to two tweets about it this morning. He basically said Google is always changing. Here are those tweets:
He also commented in that last hangout saying he wasn't aware of anything specific regarding this update.
I am sorry I couldn't get something official outside of a no comment but I tried.
Forum discussion at WebmasterWorld.