I can confirm GWT back link updates. On a 9 year old site big increase. Also on also on a 8 month old site, slight increase. On the newer site I noticed a DMOZ link is included (so DMOZ have also updated :)
I have a decrease in the number of backlinks on GWT, while in the last couple of months few links were added. But, about 15% of the pages have come out of supplementals, which shows those pages have increased their PR.
I'm seeing some changes. I had several hundred pages come out of supplemental on one of my sites, and I'm seeing things like newer pages with PR0 showing as PR2, and my home page which was PR4 doesn't appear to have a current PR. Might be an update, might be not.
I just noticed my site has risen to the first page for the single word main keyword that I never even tried to get ranked for, because I thought it would be impossibly hard. Never been higher than #20, usually closer down around #100. I did get a whole bunch more backlinks this season, so maybe my PR rose behind the scenes or something.