Database Navigator plugin has been upgraded to version 8.1 of IntelliJ IDEA - see release 2.0 (1264).
The plugin is available for download at http://plugins.intellij.net/plugin/?id=1800.
The plugin conflicts with the SQL functionality provided by JetBrains in the standard distribution, and it will become proprietary on your project *.sql files.
Although both plugins can coexist in the same instance of IntelliJ, it is strongly recommended that you disable the built-in SQL functionality if you want to use Database Navigator. A dialog box will be prompted first time after you install Database Navigator advising you to disable the SQL plugin.
Please also note that the plugin still supports only Oracle and MySQL.