Well... I cannot speak for every one's sites... but I can tell you my site map page is a PR6 and the update before it was a PR6... if you look at the PR by DC's you will see both.
I have a deal with google. I ask what page my pr will get before I even make it. If its less than 5, I don't even bother
I agree though that the repetitive threads on this subject are really annoying. I mean, it's not like the update is that important anyway. I personally would like to see a sticky thread where people can go in and report the updates and this would mean that there is only 1 thread for this. Any other threads started could get merged into the sticky thread. Just a suggestion
I thought G only updated every 3 months. Have they just started messing with it whenever they feel like it?