Posted August 27, 2014
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http://forum.nordicgames.at/showthread.php?186204-Why-will-the-whole-NordicGamesCatalog-be-pulled-off-from-GOG&p=2680511#post2680511 (Darksiders, TitanQuest, BlackMirror, Gothic II& III, countless others...)
Important: This is the INTERNATIONAL part of the forum, so everybody can participate!
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http://www.gog.com/forum/general/last_chance_special/post226/?staff=yes
Essentially, neither of them wants this to happen, and they will continue to work to bring the games back here, but there are contractual / legal obstacles that prevent this from happening right now. Nordic and GOG are still on good terms.