I currently don't specify prop=details with my bots (a few use this feature), but on the API docs it's listed as default. Can you give us a sample of how the new one is going to look? Also does it only change for block and pagemove logs? or is it more than that.

English Wikipedia Administrator and Checkuser

On Wed, Jan 2, 2013 at 1:28 PM, Brad Jorsch <bjorsch@wikimedia.org> wrote:
Due to bug 43221 and Gerrit change I1a3c7ac6, the format of the
"details" for some log events will be changing. In particular, any
event with details that were returned with a key resembling "4::foo"
will now be returned under a key of simply "foo".

This change will be deployed with 1.21wmf7, which is scheduled for
today on mediawiki.org, test.wikipedia.org, and wikidata; 7 January
for non-Wikipedia sites; 9 January for enwiki; and 14 January for the
other Wikipedias.

Brad Jorsch
Software Engineer
Wikimedia Foundation

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