I am not sure, if this is the right place.
I recently found this announcement on the Steam Network :
It seems, that X-Plane 10 will be published over the gameing plattform Steam in the future : http://steamcommunity.com/sharedfiles/filedetails/?id=201361798
The "Steam Greenlight Certification Program" requires a future Steammachine Console Version and lots of "Special License Agreements" from Valve Inc. As it is been known from other Steam-Games, Mods (in our scene, better known as Addons) can only be pusblished via Steam itself - Valve Inc wants to earn on a comission on any DLCs or Mods on their published titels, of course.
As far as I know the Steam requirements, that means : good bye to freeware or any other publishers for X-Plane 10 addons in the future !
Can somebody confirm that ?
Thanks !