We posted the first beta of Zimbra 4.5 this past Friday.
Major new features of 4.5 include complex password enforcement, identities, personal distro lists’s, server performance improvements, backup/restore in the admin console, a search builder in the admin console, user-set default fonts for HTML compose, an upgrade to use MySQL 5.0, and a Lotus Domino migration wizard. More details can be found in the beta release notes.
