+* $wgRC2UDPAddress, $wgRC2UDPInterwikiPrefix, $wgRC2UDPOmitBots, $wgRC2UDPPort
+ and $wgRC2UDPPrefix have been removed.
+* The default password type for MediaWiki has been changed from MD5 to PBKDF2.
+ Password hashes will automatically be updated as users log in. If necessary, the
+ old MD5 hashing can be restored by changing $wgPasswordDefault to 'B'. In addition,
+ there is a maintenance script wrapOldPassword.php that can wrap all passwords in
+ PBKDF2 (or the hashing algorithm of your choice) if you don't want to wait for your
+ users to log in.
+* $wgImportSources can now either be a regular array, or an associative map
+ specifying subprojects on the interwiki map of the target wiki, or a mix of
+ the two. Existing configurations will still work.
+* Users must be able to edit through a page's protection to be able to delete it.