Benjamin Lees, 10/06/2013 08:13:
While I'm not aware of privacy changing substantially, speaking of
fantastic names, Kraken is going to change things a bit compared to 2010:
https://www.mediawiki.org/wiki/Analytics/Kraken/Request_Logging
https://www.mediawiki.org/wiki/Analytics/Kraken/Data_Formats
I didn't find a human-readable overview but the gist seems to be that
WMF will log the same (partial) data, but for 100 % of visits rather
than 1/1000.
More technical members of the list will be able to tell more from the
specifications and source code.
Nemo