The new version of MediaWiki will be on test wikis and MediaWiki.org from 17 September. It will be on non-Wikipedia wikis and some Wikipedias from 18 September. It will be on all wikis from 19 September (calendar).
The Wikipedia app for Android invites users to do small tasks. This is to get more readers to edit. If they get reverted too many times it will pause or block the tasks for that user. All normal editing will still work if the community doesn’t block the user. The developers want to know if the plan looks OK. You can see what it could look like and give feedback.
When you look at an old version of a page you get a warning that this is not the newest version. This uses the CSS class .mw-revision. It will use the CSS class .warningbox for styling instead. If your wiki uses templates to change how the warning looks they will have to be updated. This will happen later. If this would cause problems you should tell the developers in the next couple of weeks. 
Latest tech news from the Wikimedia technical community. Please tell other users about these changes. Not all changes will affect you. Translations are available.
The mobile web will get more advanced editing tools. Seven more Wikipedias can use them now. This works for Arabic, Indonesian, Italian, Persian, Japanese, Spanish and Thai Wikipedia. You can try the tools on the mobile web and give feedback. 
Changes later this week
The abuse filter system user will soon do maintenance edits on broken abuse filters. This user is called Abuse filter and has administrator rights. This is meant to fix technical problems. It will not do any other changes. You can read more.
The new version of MediaWiki will be on test wikis and MediaWiki.org from 16 July. It will be on non-Wikipedia wikis and some Wikipedias from 17 July. It will be on all wikis from 18 July (calendar).
You can join the technical advice meeting on IRC. During the meeting, volunteer developers can ask for advice. The meeting will be on 17 July at 15:00 (UTC). See how to join.
The Wikipedia app for Android will invite users to add image captions to images on Commons. It will only invite users who have added a number of edits in the app without being reverted. This is to avoid spam and bad edits. You can read more and leave feedback.