Hello.
I wrote an extension[1] for Wikinews and Wiktionary to replace the JS-driven custom tabs (Opinions in Wikinews, Citations/Template documentation in Wiktionary).
According to the manual, as there were no "pros" heard from Design-l, now the extension must undergo a technical design review, before it is decided whether the extension is able to fly on production sites - deployment review.
-- [1] https://www.mediawiki.org/wiki/Extension:NamespaceRelations