This is nice to see what previous dates were made by google but is by no means official. It is clearly written by you and is just another case of linkbaiting. This is rather misleading...
I've not noticed any changes in PR at all which seems a bit strange. I would have expected SOME change. Maybe the update is still going on, not quite sure.
I see some PR movement change but it doesn't affect any of my sites, so I am not sure whether this is a full-fledged update or not.
There may be an update going on but my website is still having PR5, PR3 and blog having PR4... No change for me.
My website haven't changed it's PR although I lose some Backlinks in my BL check. You can't really tell if there's an update in Google PR if you have same PR in your website.
this is strange .i saw other websites getting some PR changes yesterday,but still no change for my websites