You will be able to read but not edit twelve wikis for a short period of time on 23 مارچ at 06:00 (UTC). This can also affect password changes, logging in to new wikis, global renames and changing or confirming emails. This could take 30 minutes but will probably be much faster.
Changes later this week
The new version of MediaWiki will be on test wikis and MediaWiki.org from 23 March. It will be on non-Wikipedia wikis and some Wikipedias from 24 March. It will be on all wikis from 25 March (calendar).
Flagged revisions will no longer have multiple tags like "tone" or "depth". It will also only have one tier. This was changed because very few wikis used these features and they make the tool difficult to maintain.