Currently we don't have any plans concerning supporting Linux. As I always say when answering e-mails that ask about this: in GOG.com we don't like the word "never" (like in: "DRM-free old games? It'll NEVER work." ;)
Right now we're still in beta and many thing can happen before we're out of beta. Supporting open source operating system can troublesome from the technical and legal point of view but just imagine a publisher that is asked not only to allow DRM-free distribution but also a target of non-Windows operating system. That's why we can't promise anything. If it can be done we'll probably try to find a way but don;t press us too much, ok? :)

When I said "legal issues" I meant that publishers and other rights holders would have to agree to it. I don't want to go into the details and accidentally disclose any confidential data so that'll have tobe enough from me. :)