That message has now been changed again to say it will be released "soon."

If you want the original build of the new firmware you can still download it here:

http://dl.boxee.tv/version/dlink.dsm380/1.0.3.16996/boxee.iso

And you can manually flash the Box like this:

http://support.boxee.tv/entries/328816-how-do-i-manually-upgrade-the-boxee-software