I am seeing reports from across the SEO forums that Google has updated or begun the update of the PageRank score found within the Google Toolbar.
The last time Google updated toolbar PageRank was in late February. Google did recently update the Directory PageRank scores earlier this month. You can see some history on these recent PageRank updates over here.
What this all means for your Google rankings? Not much. Typically, a Google Toolbar PageRank update will have zero direct impact on one's ranking in Google. As Google has said, time and time again, the toolbar PageRank scores are older exports and do not resemble the PageRank score Google uses internally, at the time of ranking your pages in Google.