did you see my thread a couple hours before yours? all through 2009, casio updated the first link in your post at the end of the month with next month's japan market models. interestingly, or not, it has yet to be updated for january 2010.
casio also has an email mailing list in which it sends out basically the same release information.
then we have catalog scans or trade show photos released through unofficial channels like here, mygshock.com, or japanese-language forums and blogs.
and sometimes, casio europe or usa will issue a press release that is the first to break new models.
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