As a followup to the previous update that was reversed last week, which Matt Cutts stated was an error of the "Parking Classifier"... I had reported that one of my sons had a hobby site hit by that update. He is about as far away from an SEO as you'll find.
His hobby site returned 2-3 days later, after Matts statement about there being an error in the parking classifier.
The hobby site is gone again after this latest update on the 24th.
My opinion, is that the message about a "Parking Classifier", was really just the precursor for tuning this current update. IMO, If a few of the bigger site owners who complained heavily on the Google Webmaster Forums had not stepped up, this algo update released on the 24th, would have come a week sooner.