The wikis now look slightly different in the mobile web version. 
Changes later this week
There is no new MediaWiki version this week.
You can join the technical advice meeting on IRC. During the meeting, volunteer developers can ask for advice. The meeting will be on 23 April at 15:00 (UTC). See how to join.
Wikipedia articles will have the sameAsmeta property. It adds structured data. This makes it easier for search engines to find Wikipedia articles. It also makes it easier to reuse content. There will an A/B test.