Yesterday, as well as today, I spotted dozens of threads on Google updating their site's toolbar PageRank scores. I didn't want to post the details until today, simply because it was April Fools. But the PageRank update seems to be here and like always, too many people care.
Yes, it seems like Google did push out a toolbar update. I will quote one post from all of these threads. The post is from Googler, JohnMu in the Google Webmasters Help thread:
I'm pretty sure we'll have another Toolbar PR update this year. However, as touched upon by the others, this is generally not something you need to worry about.