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Changes later this week
- The new version of MediaWiki will be on test wikis and MediaWiki.org from 1 December. It will be on non-Wikipedia wikis and some Wikipedias from 2 December. It will be on all wikis from 3 December (calendar).
- The iOS Wikipedia app will show readers more of the article history, allowing them to see new updates and how the article has changed over time easier. This is an experiment, it will first be shown only to some iOS app users as a test. 
- The Wiki Replicas can be used for SQL queries with for example Quarry and PAWS. To make the Wiki Replicas stable there will be two changes: Cross-database
JOINS will no longer work and you will only be able to query the database of the project that you used to connect to the database. This will happen in February 2021. If you think this affects you and you need help you can post on Phabricator or on Wikitech. 
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Fine print: Tech news in British English (en-gb) does not necessarily use British spelling. It is only British in spirit, unoversimplified when compared to the regular English version, allowing more complex terms (e.g. "issues" instead of "problems") and constructions.