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These days rather than having a large monolithic update, Google tends to have smaller (and more frequent) individual launches.
Some people might have noticed some changes around Sept. 22, 2005. Or some CJK folks might have noticed some changes around Oct. 5, 2005. Or a few European folks might have noticed some changes around Oct. 7, 2005. Or some people might have noticed some changes this past weekend.
My point is that more than ever, we are constantly working to improve our algorithms and scoring. Some changes are hardly noticed at all. Some changes (e.g. user interface improvements) are more visible. Some changes have nothing to do with spam, such as the changes for Chinese and Europe that I mentioned above. Some changes do try to decrease spam or increase core quality.
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Just to give you a heads-up, I think a new set of backlinks (and possibly PageRank) will probably be visible relatively soon; I’m guessing within the next few days. I still expect some flux after that though, just to let you know.
Matt Cutts - inginer la Google