Minor PR update have been seen in some sites where PR gone 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 is yet to be expected. Its varying 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 its small PR update.