Last night, Google started pushing out new PageRank data to the Google Toolbar users (if you can find any one using the toolbar anymore).
The previous PageRank update was done in August 2012 and typically occurs ever few months or so.
Despite PageRank still being part of the algorithm, SEOs know that toolbar PageRank is often outdated and not that useful. In addition, there are many other factors part of the algorithm that may or may not be as important as PageRank.
Hobo has a list of some major sites that were updated with this PR update.
I hope your PageRank increased and did not decline at all - ego is an important thing.