Chinese site, iDealsChina, has photos of what they report is a Griffin Technology iPhone case mold for the 3G iPhone. The mold is for the silicon Flex GRIP case.
The molds show a slimmer iPhone with rounded edges.
According to the site, the molds are finished and they have begun manufacturing cases.

We have an email out to Griffin about this article, and will update you when we get a response.
Links:
[1] http://www.idealschina.com/Insider/
[2] http://www.maclife.com/article/3g_iphone_why_it_matters
[3] http://www.maclife.com/article/the_fcc_and_the_iphone