Hiya
There is some information about the stand-alone add-on in the FAQ's:
http://www.shipsim.com/ShipSimForum/index.php/topic,3052.0.html
I would like to quote from that post, this part in particular:
Also the SS08 Add-On Product itself will follow at a later stage, when we created and translated the missions for it.This information is the most up-to-date we have at this time
Regards.
DJM.