As discussed on the Foundation-l mailing list, a Facebook group called "Vandalize Wikipedia day" was set up and deleted recently.
The "Content scope" task force of the Foundation's Strategic Planning project is currently drafting a "project policy", which includes "a number of questions to be considered before a new [Wikimedia] project is accepted."
The rollout of the new user interface will take place on 5:00am UTC on May 13, as announced on May 1st by Naoko Komura from the User Experience team. The process is expected to take two to three hours. Details of the changes had already been described in a March 25 announcement (see earlier Signpost coverage). Users who prefer the old interface will be able to deactivate the new features easily (see FAQ). On Commons, the default skin had already been switched to the new interface on April 5.