The Communications committee is working on coordinating the use of sitewide notices for Wikimedia projects. This is needed for the upcoming fundraiser, as well as other potential announcements relevant to all projects, such as Wikimania or technical issues like single login.
It's anticipated that we will use a bot to help update these messages, which due to the nature of the pages being edited will need to have universal sysop privileges. Rest assured that we won't be using it for other sysop functions. Naturally, with all of these messages we will need help with translation, ideally before they are distributed but also after if necessary. Please let your projects know in case they have any questions.
Incidentally, I know the idea of a Fundraising committee is still just getting off the ground, but could we get an idea of when we would have a fundraiser, and for how long? In order for the site notices to be effective, we have to maintain some downtime between uses, and we need to be able to plan the other uses as much as possible.
--Michael Snow Chair, Wikimedia Communications Committee