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Yes, we could think that they changed their algo and sites with fewer links to them should see their PR decreased... but the strange thing is that not all sites decreased. Coincidence or not, only the comercial ones decreased. I still see Universities (like mine) with only 706 links to them, and they still have their PR7. And by the other hand, one of our biggest portals, with 4550 links, decreased to PR6.
On my case I could only think that they decreased the value of my DMOZ link (but the DMOZ page still has PR7, and no new links were added), because nothing really changed.
Maybe they are giving an extra boost to quality only links (with high PR, or relevant subjects), because sites with few links to them, still have high PR´s.