crobb305 - 3:26 pm on Oct 1, 2012 (gmt 0) [edited by: crobb305 at 3:35 pm (utc) on Oct 1, 2012]
I have observed some partial-match domains taking big hits.
For example, in my niche:
fell over 100 positions for: big blue widgets (plural)
Another observation is a website that was hit by Penguin (EMD) and successfully regained its rankings after redirecting to a new domain (NOT an EMD) back in June took a big hit on Friday. I believe this was because the permanent redirect originated from an EMD.
My observations assume that this update was only about EMDs (per MC's tweet), and had nothing to do with Panda/Penguin.
[edited by: crobb305 at 3:35 pm (utc) on Oct 1, 2012]