"Back soon" is really strange if there is no communication and of' course there is no new version or something else...
Someone has further information about that?
edit: I found the following in the latest answer at Internal Server Error
They removed it because it directly includes wp-load.php (IMO there is a good reason to do so), working on it to get it back. You should receive updates anyway (3.1.05 includes the fix), served through the WP-Filebase Pro update channel, even if you are on free. Otherwise check https://github.com/f4bsch/WP-Filebase for latest changes.
It seems to me, plugin have to be rewritten so there is no need to include wp-load.php.