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The Google Update History [webmasterworld.com] shows it on the 19th in 2000 and the 27th last year. Ya' never know!
So my theory is this - Google is doing some extra deep crawling closer to the update with the idea that the next one will be well after the holidays towards the end of January?
"Sounds like we've been following a holiday theme lately (with Halloween and Thanksgiving). Just don't expect us to be working on Christmas Eve. Even googlers and their thousands of machines have to take a break sometime."
At first I thought he was implying no December update (so the machines can take a break) but then realized maybe just no update on Christmas eve or Christmas Day. Who knows. LOL
C :)
My guess is that it is all automated. Thus, they could push a button on Christmas Eve, and the computers do their stuff. Unless nobody at Google celebrates Thanksgiving, the holiday didn't stop the update.