The administrator has complete over who can create and edit pages. What's more, individual pages can be have their own custom user permission settings.
Sort and manage your wiki articles: recently added, recently edited, recently discussed and alphabetical order. Additionally, you can use categories, tags and sub-pages.
Users can follow wiki pages to keep track of changes. The subscription manager displays recent changes to tracked pages. (Requires BuddyPress.)
Wiki pages can be flagged when they require attention due to poor or inappropriate content (much like Wikipedia/MediaWiki). What's more, administrators can easily create custom flags using wp-admin.
UserPress can compare changes to documents (diff) while also attaching a note with each revision.
When users are creating a new page, similar existing pages are automatically displayed in order to prevent duplicate content.
Since UserPress is built for WordPress your wiki can instantly benefit from thousands of plugins.