Wikipedia and its sister projects are organized at the Wikimedia Foundation (WMF). Wikimedia-wide issues can be discussed either on Wikipedia Meta or on the Wikimedia-l mailing list. If you ever want to bring an issue to the attention of the entire Wikimedia community, the foundation list is the best medium for doing so. But please use project-specific mailing lists for issues which concern just one project. You do not have to subscribe to keep up with the mailing list's postings‍—‌they are archived here.

Another source for what is happening is Goings on, which provides a weekly digest. On Wikipedia, to keep up with current events, visit the Wikipedia:Community portal.