Google is not accepting new pages for their PR update
Google has to stop accepting pages at some point prior to their PR Toolbar update. I am not sure what the exact date of their update will be or what the exact number of days is that they cutoff new pages from taking part in the updates, but I have noticed that pages that were published within a few weeks of an update have no PR.
The July 14th Google Toolbar Update is a prime example as pages from Jun 18th have a PR toolbar rating and pages published as late as July 26th have no PR. This was obviously published before the July 14th update, but wasn’t published early enough to be included.
I suspect this has a lot to do with the frequency that your site is spidered and the relative importance that Google has for your site. The next Google PR update is predicted for late October (although they love to scramble it). According to the small look I made into a brief part of their history, they stop accepting new material about 3 weeks prior to the update.
I am not positive when they will stop accepting pages for the next Google update, but I strongly suspect this time will come within the next week or two… or less. Waiting for the update to begin does not help you out as pages are stored for processing before the dance begins. Get your best pages up now to get in on the next update.
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It turns out, according to the PageRank of the articles on this site, that PageRank was actually cutoff between Oct. 3 and Oct 10. I have looked around and the date seems more toward the 10th… guess I should have written more during that time to track the date.