Well, that's what they always say and then a few weeks later the situation is reverved to the pre-update situation. What noticable updates have we seen lately, anyway? Jagger was not a real update. It was reversed beginning Feb. and served to keep spammers out of the xmas sales, only.
BD was an infrastructure update, not an algo update and the current update that was already going on before 6/27 has the same charateristics as Jagger: high PR sites in front, probably an anti-spam measure. But users don't like to have all the dinosaurs in front, so this update will be reversed too. The question is: what's at stake now? Summer sales (whatever that is), spam in the travel sector?
Now with everflux the question arises: if an "update" is noticable to most people, is it a real update? Google has been at it for so long, what are the chances they are going to find a tweak that will radically improve the SERPs?
I maintain that with an update we should be able to find characteristics, because that's the purpose of an algo update: to change the SERPs in a meaningful way.
And what's with the "site:" trouble? Is that part of the update?