An improved impact module will be available at Wikipedias. The impact module is a feature available to newcomers at their personal homepage. It will show their number of edits, how many readers their edited pages have, how many thanks they have received and similar things. It is also accessible by accessing Special:Impact. 
The new version of MediaWiki will be on test wikis and MediaWiki.org from 23 May. It will be on non-Wikipedia wikis and some Wikipedias from 24 May. It will be on all wikis from 25 May (calendar).
Latest tech news from the Wikimedia technical community. Please tell other users about these changes. Not all changes will affect you. Translations are available.
Citations can once again be added automatically from ISBNs, thanks to Zotero's ISBN searches. The current data sources are the Library of Congress (United States), the Bibliothèque nationale de France (French National Library), and K10plus ISBN (German repository). Additional data source searches can be proposed to Zotero. The ISBN labels in the VisualEditor Automatic tab will reappear later this week. 
For a few days earlier this month, the "Add interlanguage link" item in the Tools menu did not work properly. This has now been fixed. 
Changes later this week
The new version of MediaWiki will be on test wikis and MediaWiki.org from 30 May. It will be on non-Wikipedia wikis and some Wikipedias from 31 May. It will be on all wikis from 1 June (calendar).
VisualEditor will be switched to a new backend on small and medium wikis this week. Large wikis will follow in the coming weeks. This is part of the effort to move Parsoid into MediaWiki core. The change should have no noticeable effect on users, but if you experience any slow loading or other strangeness when using VisualEditor, please report it on the phabricator ticket linked here. 
Previously, clicking on someone else's link to Recent Changes with filters applied within the URL could unintentionally change your preference for "Group results by page". This has now been fixed. 
For a few days last week, some tools and bots returned outdated information due to database replication problems, and may have been down entirely while it was being fixed. These issues have now been fixed. 
Changes later this week
The new version of MediaWiki will be on test wikis and MediaWiki.org from 6 June. It will be on non-Wikipedia wikis and some Wikipedias from 7 June. It will be on all wikis from 8 June (calendar).
Bots will no longer be prevented from making edits because of URLs that match the spam blacklist.