Well, maybe not a total abdication, but Jimbo has relinquished a substantial portions of his powers. See his announcement and the context.
In an upcoming academic article I discuss why calling Wikipedia a monarchy/dictatorship, while not too off the mark in its very early stages, is no longer true. It's nice not to be contradicted by the current events :)
Victory at the Fourth Circuit: Court of Appeals allows Wikimedia Foundation v. NSA to proceed - The decision marks an important victory for the privacy and free expression rights of Wikimedia users.
52 minutes ago