The Disambiguator extension (http://www.mediawiki.org/wiki/Extension:Disambiguator) is now deployed to all WMF wikis. This will enable us to:
1. Remove disambiguation code from core, including Special:Disambiguations (bug 35981)
2. Stop requiring wikis to maintain template lists at MediaWiki:Disambiguationspage
3. Add features like warning users when they are linking to disambiguation pages (https://gerrit.wikimedia.org/r/#/c/70564)
4. Remove disambiguation pages from things like Special:Random and Special:LonelyPages
4. Enable the development of more powerful 3rd party tools for dealing with disambiguation pages

There is, however, one action required of each wiki that wants to make use of the Disambiguator extension: Every disambiguation page on the wiki needs to include the __DISAMBIG__ magic word (or an equivalent alias). Typically, this only requires adding the magic word to a single template that is included on all the disambiguation pages. For example, on Commons, this was accomplished with the following change:
https://commons.wikimedia.org/w/index.php?title=Template%3ADisambig&diff=99758122&oldid=99728960
On English Wikipedia, it was a bit more complicated:
https://en.wikipedia.org/w/index.php?title=Template%3ADmbox&diff=560507118&oldid=540384230

Once you've made this change, you should start seeing pages appear on Special:DisambiguationPages within 3 days. If you have any questions or problems, let me know.

Ryan Kaldari
Wikimedia Foundation