In the SO blog post "Introducing Stack Exchange Data Explorer" (2010-06-13), Jeff states in a footnote:
we are looking at eventually making special weekly or biweekly dumps for SEDE
Is this still planned?
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This is something only the Stack Exchange team can (and should) provide a definite answer for right here, of course, but at least it is still mentioned quite prominently as the last point in the respective FAQ, so right now we have every reason to believe that your
feature-request is in fact
How frequently is Stack Exchange Data Explorer updated?
At the moment it is updated shortly after every Stack Exchange Creative Commons Data Dump. We plan to update the data of SEDE weekly or even bi-weekly some time in the future.