+* Several classes have been moved from the MediaWiki\Storage\ namespace to the
+ MediaWiki\Revision\ namespace. The old class names are aliased for
+ compatibility, but are deprecated. Classes are IncompleteRevisionException,
+ MutableRevisionRecord, MutableRevisionSlots, RevisionAccessException,
+ RevisionArchiveRecord, RevisionFactory, RevisionLookup, RevisionRecord,
+ RevisionSlots, RevisionStore, RevisionStoreRecord, SlotRecord, and
+ SuppressedDataException.
+* When using OOUI HTMLForm containing an 'info' field which uses the 'rawrow'
+ option, it is now deprecated to give its contents (the 'default' option)
+ as a string. They should be given as a OOUI\FieldLayout object instead.
+ Notably, this affects fields defined in the 'GetPreferences' hook, because
+ Special:Preferences uses an OOUI form now. (If possible, don't use 'rawrow'.)
+* In Skin::doEditSectionLink omitting the parameters $tooltip and $lang is
+ deprecated. For the $lang parameter, types other than Language are
+ deprecated.
+* The $wgUseKeyHeader configuration option and the
+ OutputPage::getKeyHeader() method have been deprecated; the relevant
+ draft IETF spec expired without becoming a standard.