The highlights of this release are: support for viewing attached office documents in the wiki, an experimental Extension Manager, experimental CSRF protection, a new User Directory, further improvements to the edit UI, more consistent use of user avatars, support for activating a special accessibility stylesheet, and an experimental xwiki/2.1 wiki syntax.

For more details, see http://www.xwiki.org/xwiki/bin/Main/ReleaseNotesXWikiEnterprise25M2