User blog comment:BertH/Layout and navigation updates coming October 3/@comment-5072107-20120920192532/@comment-5275700-20120921182510

Apologies for my misunderstanding of the divider comment. We have not observed any drops in edit rates related to the new wiki navigation and its addition of the thin horizontal line. The A/B testing was around the old, larger divider containing text, that's seen in the post you linked.

I can confirm that the click-tracking for both navigation styles included the wiki activity and random page options.