Ingsoc85: Most likely not for a very long time, a far as I understand Daedalic doesn't have the rights to sell the German version in the international market, hence most of their games are here without the original German version.
Quasebarth: This would be true for some Daedalic games, like Chains of Satinav or Memoria, but Deponia is directly developed and self-published as far as I know. They have a distribution partner for the German boxed retail though, but seeing that they can sell Deponia 3 in every language on Steam and other digital distributors, I doubt this does have an effect here on GOG.
It is solely up to Daedalic to bring the German language (and also where is the soundtrack for the game this time?) to GOG I would say. and they decided against it for whatever reason.
The Deponia games always were on gog.com a bit later - so that there wasn't a cheaper digital German version available while Daedalic still hoped for strong domestic retail sales.
That month of penalty time, however, is over. The game was indeed self published, the voices indeed belong to Daedalic entertainment and the very same contractual obligations to their publisher apply. There's indeed no reason for Daedalic not to put the German voices online, and I am thoroughly annoyed by this little ploy.
Daedalic has a history of asking adequate prices from their German crowd through Steam and retail, but giving away their games for a dirty dime anywhere else, thereby effectively reducing the perceived worth of 2D adventure games internationally. They can't pull off that international pricing crap on gog.com, so they just thought up another kind of penalty. It's a disgrace.
