* The 'editcontentmodel' permission is now granted to all logged-in users ('user').
instead of just administrators ('sysop'). Documentation for this feature is
available at <https://www.mediawiki.org/wiki/Help:ChangeContentModel>.
+* $wgRevisionCacheExpiry is now set to one week by default instead of being disabled.
=== New features in 1.28 ===
* User::isBot() method for checking if an account is a bot role account.