you have plenty of time till august to work on your website i`m guessing it will happen arround the first august week
Exactly . I had an update in my site PR5 . which got alot of PR4 subpages ( was PR0 before ). Confirmed
We have just had a major PR update about a month back and the next one is probably 2 months away. People experiencing changes in their rankings is probably due to minor updates taking place in google's back end, accidentally getting reflected in the front end... Regards, RightMan