Kelowna - 6:25 pm on Oct 1, 2012 (gmt 0)
I think Google is only telling a small part of the story by saying this update goes after emd's.
It appears to me and the sites I watch that possibly some sort of penguin refresh was thrown in as well to go after inbound links that look shady. A few weeks ago we noticed someone bombing one of our sites with profile links all using the same main keyword for about 3 days. The site is not an emd but like most sites on the net it does have one partial keyword in the url and now has tanked in the listings with this update. Now inner pages all rank lower in the serps but the main url is nowhere to be found, this smells a lot like a OOP for that keyword now. If I search for the domain name minus the .com it comes up as number 1 so the site is not penalized, just the main keywords. This would explain a lot of the mixed results people are seeing.