We've put together an RC for 1.22.0. Please test the tarball and report any bugs you find on Bugzilla: http://bugzilla.wikimedia.org/
Full release notes: https://git.wikimedia.org/blob/mediawiki%2Fcore.git/tags/1.22.0rc0/RELEASE-N... https://www.mediawiki.org/wiki/Release_notes/1.22
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Download: http://download.wikimedia.org/mediawiki/1.22/mediawiki-1.22.0rc0.tar.gz
GPG signatures: http://download.wikimedia.org/mediawiki/1.22/mediawiki-core-1.22.0rc0.tar.gz... http://download.wikimedia.org/mediawiki/1.22/mediawiki-1.22.0rc0.tar.gz.sig
Public keys: https://www.mediawiki.org/keys/keys.html