One quick look in the google sub forum (or reading a few posts in this sub forum) would show it started to update about a week ago, so old news now.
The PR updated in the toolbars April 2-3, for a few days search results were different, looks like things have now settled down.
I too noticed change in my PR for one site changed from PR4 to PR3 and one got up a notch PR4 to PR5 so I guess G is in the process of updating.
Ok one HUGE misconsumption people have about PR... Page Rank is updated constantly, and different sites get the toolbar PR value changed in different times. Google is updating that PR value all the time, it's not like it happens 3 times in a year for the entire web at the same time, that would be just plain stupid use of resources.