BillyS - 12:52 am on Jul 9, 2013 (gmt 0)
Based on tools like MozCast, it seems like there were two big events. The first appeared to be aimed at PMDs / EMDs. I haven't seen any assessment of round two. Doesn't look like much movement since the 4th of July at this point.
I'm not sure what really changed, I'm still seeing big brands dominating the SERPs, even if they don't have the keywords on a page (or any content). I really find it hard to believe the user experience is getting better.