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To see the previous dates of the update visit the Google Update history [webmasterworld.com]
But i think DMOZ would do all they can to provide Google with a fresh RDF dump, it's great publicity for them.
I just wondered why Google didn't update it's directory last month after the update begun til now or maybe it's just like you said, they did get an RDF dump too late for the latest cats to be included.
Hm, actually the dump has to be over 4 weeks old since I added a category a while back in dmoz and it's not yet in googles structure.
I noticed a lot with the latest update, that if you change directory.google.com to dmoz.org, you quite often get this category doesn't exist (due to the re-structure of dmoz)