I see some changes here too. I got a PR7 for one of my sites. And some minor PR5 and PR4 for 6 other sites. Pleased but not extremely happy considering the amount of work. But What can I say? Google invented PR, Google delivers PR as IT wishes. MONOPOLY rules !!!!!!
The update is already completed. You might have not gotten enough quality backlinks to get a Page Rank update.
Thatz great that you have got PR4, 5 and 7, congratulations... BTW your signature link shows PR0, why couldn't you increase the PR on this one ?
Last week Google is updated the PR, some of my sites PR is increased. and that updating is over now so we need to wait for some days.