Minor PR updates have been seen in some sites where PR went from 1 to 2 or 2 to 3 and in some cases from PR 0 to PR3.

Seems that its small PR update and Big PR update are yet to be expected. It varies between PRn/a, PR0, and what appears to be true Page Rank, I have not seen any changes on several other sites, so it seems it’s a small PR update.