The new Advanced Search interface is now available as a Beta Feature on all wikis. This makes it easier to learn about and to use many of the powerful options in our search. Feedback is appreciated. 
Changes later this week
The new version of MediaWiki will be on test wikis and MediaWiki.org from 15 May. It will be on non-Wikipedia wikis and some Wikipedias from 16 May. It will be on all wikis from 17 May (calendar).
You can join the technical advice meeting on IRC. During the meeting, volunteer developers can ask for advice. The meeting will be on 16 May at 15:00 (UTC). See how to join.
In the mobile view, warnings for when something is wrong with a page are not as clear as they should be. The developers are working on this. You can give feedback and suggestions.
The developers are working on making the Wikipedia Android app available in more languages. You can give feedback, suggestions and help test it. Read more on mediawiki.org