Go there & watch their spring conference there is a cryptic message about early viewers getting something more may be free games not sure what else it could be.
http://www.gog.com/news/spring_conference
"* give you a special gift as a big, sweet “thank you” to our users"
http://www.gog.com/news/spring_conference
"* give you a special gift as a big, sweet “thank you” to our users"