REL1_23 has been branched, and MediaWiki 1.23.0 is expected to be released by the end of May.
http://git.wikimedia.org/log/mediawiki%2Fcore.git/refs%2Fheads%2FREL1_23
http://lists.wikimedia.org/pipermail/wikitech-l/2014-April/076002.html
It contains
[mediawiki/core.git] / skins / vector / variables.less
@content-heading-font-family: "Linux Libertine", Georgia, Times, serif;
Please consider reverting in REL1_23 the font choices for headers applied to the MediaWiki master branch the past weeks. They are known to cause problems and unintended behavior in Chinese / Japanese / Korean, and perhaps other non-Latin scripts. The work to define font choices for MediaWiki is ongoing, and currently it is too unstable and risky to be pushed in an official MediaWiki release.
Once the implementation is settled in the master branch, it can be pushed to the corresponding MediaWiki release.
Version: 1.23.0
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=63351