A representative for GOG wrote: "We've seen a lot more of you guys voting on this wish recently and I thought it was only fair for me to update you. Linux is a great platform, and we love how much passion you guys are showing for it here on our wishlist. We definitely know that it's one of the top things our community wants from us, but it's also really difficult to bring the GOG.com level of support and ease-of-use to the wide variety of distros that are commonly used by Linux users. If we're able to bring GOG.com games to Linux--and we're constantly evaluating ways that we can do this--we want to make sure that we're doing it the GOG.com way: simple, easy, and it "just works." I'm not telling you guys to give up hope--we know how much you want this--but what I am saying is that this is harder to support than it might seem initially, and we're not ready to move to support Linux officially just yet."
It's not the best response, but not the worst. Basically they're looking at ways and seeing how feasible the Linux port could be, citing one of the common arguments from game vendors is that there's too many distributions / many possible combinations out there due to the open nature of Linux. Valve has seen this as an issue too with Steam and the Source Engine, which is why their current beta is just targeting Ubuntu Linux.
Let's see how the Linux gaming scene evolves in the coming months.