Because of a server test to make sure we can still keep the wikis alive if a catastrophe happens, you can't edit the wikis for up to an hour on 12 September. You can read more.
Editing of sitewide CSS/JS will soon be restricted to a new user group, to improve the security of MediaWiki and the Wikimedia projects. The new group will be managed by the local communities, who need to set up the appropriate policy. To find out more and give feedback, see Creation of separate user group for editing sitewide CSS/JS.
June 12 - July 2:
The Strategy core team invites everyone interested in strategic conversations and competent in selected thematic areas to join the Working Groups. Up to 135 persons representing diverse perspectives and roles within the Wikimedia movement will be selected.