Ic5ba836364d04b2c3814777b69b5f47fce25292a , as noted in http://lists.wikimedia.org/pipermail/wikitech-l/2014-March/075498.html, introduced extensive CSS changes, but has no release notes, in total disregard of [[mw:Manual:Coding conventions]]. Unless fixed, the change is liable to immediate revert; at any rate, it can't land in a stable release as is.
We need release notes explaining:
- what changed exactly,
- how a wiki can be configured to keep the 1.22 styles.
Once done, though it's not on the "coding" mandatory part,
- MediaWiki users need to be notified on mediawiki-l,
- [[mw:MediaWiki 1.23]] needs to be updated.
Point (1) can perhaps be achieved by distilling the content of [[mw:Typography refresh]], while for (2) we're currently in total lack of rationales (cf. https://www.mediawiki.org/?oldid=945913#Wikipedia_or_MediaWiki.3F) and on (3) I've not heard anything.
On (4), the extensive usage of Wikimedia-only discussion venues, for months, gave the definite impression that this change was planned for Wikimedia projects only, so (unless the change is reverted in core) an energic communication will be needed to compensate and properly notify/involve MediaWiki users.