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Having said that, Google most commonly spiders deeply after the update is in progress - near the end of one month- beginning of the next.
I don't think this is the case at all, that would just be a signal that your site needs freshbot.
Freshbot, of cource likes new information it AFAIK does not change PR or take off page information into account. That being said if the keywords you are interested in for the month of Dec are not so competive that you must have links pointing to them with the keywords. and you have a few pages with good PR for those keywords freshbot is the bot for you.
For freshbot I change content for every bot visit. But maybe i am working too hard? i see other sites with fresh listing that really have not changed.
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for what shows in Dec based on the full crawl, i am thinking its past cutoff but i may be wrong i would not call it quits untill the 11th or 12th. Its now or next year for dec SERPs
Sorry if I'm nowhere near the point guys!
I'm thinking of renaming my files to include my keyword phrase since my domain does not have any keywords (back in '98, I didn't realize targeting SE's would be more important that branding - oops!). I'm trying to figure out when to do this and not get my site dinged.